Finished with error: Failed to establish connection with the application instance in Chrome.

I am getting this error when running my project on flutter web:
Launching lib\main.dart on Chrome in debug mode...
Building application for the web...
Attempting to connect to browser instance..
Finished with error: Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.

Hi @umair-ilyas
can you please provide your flutter doctor -v ,
your flutter run --verbose
and your pubspec.yaml
or if possible a reproducible minimal code sample.
Thank you

Hi, @iapicca
I am getting the same problem.
here is my flutter doctor -v:
`PS D:\Project\myapp> flutter doctor -v
[√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version 10.0.18362.535], locale en-US)
• Flutter version 1.14.6 at C:\flutter
• Framework revision fabeb2a16f (10 days ago), 2020-01-28 07:56:51 -0800
• Engine revision c4229bfbba
• Dart version 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.1)
• Android SDK at C:\Users\Ashish Joshi\AppData\Local\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.1
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[!] Android Studio (version 3.4)
• Android Studio at C:\Program Files\Android\Android Studio
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
[√] Connected device (2 available)
• Chrome     • chrome     • web-javascript • Google Chrome 80.0.3987.87
• Web Server • web-server • web-javascript • Flutter Tools
! Doctor found issues in 2 categories.`

My flutter run --verbose:
`[  +52 ms] executing: [C:\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +215 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +2 ms] fabeb2a16f1d008ab8230f450c49141d35669798
[   +1 ms] executing: [C:\flutter/] git describe --match v*.. --first-parent --long --tags
[ +182 ms] Exit code 0 from: git describe --match v*.. --first-parent --long --tags
[        ] v1.14.6-0-gfabeb2a16
[  +14 ms] executing: [C:\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +182 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[   +1 ms] origin/beta
[        ] executing: [C:\flutter/] git ls-remote --get-url origin
[ +170 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[ +219 ms] executing: [C:\flutter/] git rev-parse --abbrev-ref HEAD
[ +114 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] beta
[ +114 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[  +15 ms] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[  +29 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[  +35 ms] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +102 ms] executing: C:\Users\Ashish Joshi\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[  +62 ms] Exit code 0 from: C:\Users\Ashish Joshi\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[        ] List of devices attached
[  +25 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[  +12 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[  +19 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[  +12 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +281 ms] More than one device connected; please specify a device with the '-d ' flag, or use '-d all' to act on all devices.
[ +116 ms] Chrome     • chrome     • web-javascript • Google Chrome 80.0.3987.87
[   +2 ms] Web Server • web-server • web-javascript • Flutter Tools
[  +15 ms] "flutter run" took 978ms.

#0      throwToolExit (package:flutter_tools/src/base/common.dart:27:3)
#1      RunCommand.validateCommand (package:flutter_tools/src/commands/run.dart:325:7)

#2      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:619:11)

#3      FlutterCommand.run. (package:flutter_tools/src/runner/flutter_command.dart:537:33)

#4      AppContext.run. (package:flutter_tools/src/base/context.dart:150:29)
#5      _rootRun (dart:async/zone.dart:1126:13)
#6      _CustomZone.run (dart:async/zone.dart:1023:19)
#7      _runZoned (dart:async/zone.dart:1518:10)
#8      runZoned (dart:async/zone.dart:1465:12)
#9      AppContext.run (package:flutter_tools/src/base/context.dart:149:18)
#10     FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:527:20)
#11     CommandRunner.runCommand (package:args/command_runner.dart:197:27)
#12     FlutterCommandRunner.runCommand. (package:flutter_tools/src/runner/flutter_command_runner.dart:338:21)

#13     AppContext.run. (package:flutter_tools/src/base/context.dart:150:29)
#14     _rootRun (dart:async/zone.dart:1126:13)
#15     _CustomZone.run (dart:async/zone.dart:1023:19)
#16     _runZoned (dart:async/zone.dart:1518:10)
#17     runZoned (dart:async/zone.dart:1465:12)
#18     AppContext.run (package:flutter_tools/src/base/context.dart:149:18)
#19     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:288:19)
#20     CommandRunner.run. (package:args/command_runner.dart:112:25)
#21     new Future.sync (dart:async/future.dart:224:31)
#22     CommandRunner.run (package:args/command_runner.dart:112:14)
#23     FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:231:18)
#24     run.. (package:flutter_tools/runner.dart:64:22)
#25     _rootRun (dart:async/zone.dart:1126:13)
#26     _CustomZone.run (dart:async/zone.dart:1023:19)
#27     _runZoned (dart:async/zone.dart:1518:10)
#28     runZoned (dart:async/zone.dart:1502:12)
#29     run. (package:flutter_tools/runner.dart:62:18)

#30     AppContext.run. (package:flutter_tools/src/base/context.dart:150:29)
#31     _rootRun (dart:async/zone.dart:1126:13)
#32     _CustomZone.run (dart:async/zone.dart:1023:19)
#33     _runZoned (dart:async/zone.dart:1518:10)
#34     runZoned (dart:async/zone.dart:1465:12)
#35     AppContext.run (package:flutter_tools/src/base/context.dart:149:18)
#36     runInContext (package:flutter_tools/src/context_runner.dart:64:24)
#37     run (package:flutter_tools/runner.dart:51:10)
#38     main (package:flutter_tools/executable.dart:65:9)
#39     main (file:///C:/flutter/packages/flutter_tools/bin/flutter_tools.dart:8:3)
#40     _startIsolate. (dart:isolate-patch/isolate_patch.dart:299:32)
#41     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)`

And pubspec.yaml

`name: myapp
description: A new Flutter project.
The following defines the version and build number for your application.
A version number is three numbers separated by dots, like 1.2.43
followed by an optional build number separated by a +.
Both the version and the builder number may be overridden in flutter
build by specifying --build-name and --build-number, respectively.
In Android, build-name is used as versionName while build-number used as versionCode.
Read more about Android versioning at https://developer.android.com/studio/publish/versioning
In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
Read more about iOS versioning at
https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.1.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
The following adds the Cupertino Icons font to your application.
Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
dev_dependencies:
flutter_test:
sdk: flutter
For information on the generic Dart part of this file, see the
following page: https://dart.dev/tools/pub/pubspec
The following section is specific to Flutter.
flutter:
The following line ensures that the Material Icons font is
included with your application, so that you can use the icons in
the material Icons class.
uses-material-design: true
To add assets to your application, add an assets section, like this:
assets:
- images/a_dot_burr.jpeg
- images/a_dot_ham.jpeg
An image asset can refer to one or more resolution-specific "variants", see
https://flutter.dev/assets-and-images/#resolution-aware.
For details regarding adding assets from package dependencies, see
https://flutter.dev/assets-and-images/#from-packages
To add custom fonts to your application, add a fonts section here,
in this "flutter" section. Each entry in this list should have a
"family" key with the font family name, and a "fonts" key with a
list giving the asset and other descriptors for the font. For
example:
fonts:
- family: Schyler
fonts:
- asset: fonts/Schyler-Regular.ttf
- asset: fonts/Schyler-Italic.ttf
style: italic
- family: Trajan Pro
fonts:
- asset: fonts/TrajanPro.ttf
- asset: fonts/TrajanPro_Bold.ttf
weight: 700

For details regarding fonts from package dependencies,
see https://flutter.dev/custom-fonts/#from-packages
`
Really sorry, .yaml file dosen't seem to get dragged.
Thank in advance

Hi,
I got the same issue today while upgrading from 1.13.6 to 1.14.6
On the chrome address instead of the localhost:60538 I've got [::1]:60538
Maybe the problem is there?

You can just copy the later host in chrome. That should do it.
On Tue, 11 Feb 2020, 4:11 am cyberlahy<EMAIL_ADDRESS>wrote:

Hi,
I got the same issue today while upgrading from 1.13.6 to 1.14.6
On the chrome address instead of the localhost:60538 I've got [::1]:60538
Maybe the problem is there?
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Greetings!
I am having the same trouble connecting to chrome as @cyberlahy
I had this issue in the past when I switch from master to beta channel for flutter web. But I ran flutter clean and this did solve the problem.
Recently I upgrade to latest android studio and updated windows 10 and came across the same error:
Downloading Web SDK...                                             13.6s
Running "flutter pub get" in hdt...                                 7.1s
Launching lib\main.dart on Chrome in debug mode...
Building application for the web...
Throwing away cached asset graph due to Dart SDK update.
Attempting to connect to browser instance..
Finished with error: Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.
Microsoft Windows [Version 10.0.18363.592]
(c) 2019 Microsoft Corporation. All rights reserved.

C:\Users\hl\AndroidStudioProjects\hdt>flutter upgrade
Upgrading Flutter from C:\src\flutter\flutter...
Already up to date.
Flutter is already up to date on channel beta
Flutter 1.14.6 • channel beta • https://github.com/flutter/flutter.git
Framework • revision fabeb2a16f (13 days ago) • 2020-01-28 07:56:51 -0800
Engine • revision c4229bfbba
Tools • Dart 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
C:\Users\hl\AndroidStudioProjects\hdt>
C:\Users\hl\AndroidStudioProjects\hdt>flutter doctor
Downloading android-arm-profile/windows-x64 tools...                6.6s
Downloading android-arm-release/windows-x64 tools...                5.0s
Downloading android-arm64-profile/windows-x64 tools...              5.6s
Downloading android-arm64-release/windows-x64 tools...              5.4s
Downloading android-x64-profile/windows-x64 tools...                5.5s
Downloading android-x64-release/windows-x64 tools...                4.8s
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version 10.0.18363.592], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Chrome - develop for the web
[√] Android Studio (version 3.5)
[√] VS Code (version 1.40.2)
[√] Connected device (2 available)
• No issues found!
I ran flutter clean and cache. I even ran flutter repair.  Any Solution? I been fighting this horror for 4 days now.

Can you please provide output from flutter run --verbose -d chrome? (the log output above indicates that the tool cannot decide between chrome and web-server).

C:\Users\hl\AndroidStudioProjects\hdt>flutter run --verbose -d chrome
[ +130 ms] executing: [C:\src\flutter\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[+4670 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +1 ms] fabeb2a16f1d008ab8230f450c49141d35669798
[   +1 ms] executing: [C:\src\flutter\flutter/] git describe --match v*.. --first-parent --long --tags
[+11165 ms] Exit code 0 from: git describe --match v*.. --first-parent --long --tags
[   +1 ms] v1.14.6-0-gfabeb2a16
[  +24 ms] executing: [C:\src\flutter\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +697 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[   +1 ms] origin/beta
[   +1 ms] executing: [C:\src\flutter\flutter/] git ls-remote --get-url origin
[ +342 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[ +414 ms] executing: [C:\src\flutter\flutter/] git rev-parse --abbrev-ref HEAD
[ +549 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] beta
[ +739 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[  +13 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +398 ms] executing: C:\Users\hluma\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[+1005 ms] Exit code 0 from: C:\Users\hl\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[   +1 ms] List of devices attached
[  +22 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[+1804 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[   +5 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[   +3 ms] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[+2786 ms] Generating C:\Users\hluma\AndroidStudioProjects\hdt\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +868 ms] Launching lib\main.dart on Chrome in debug mode...
[   +2 ms] Building application for the web...
[+134594 ms] Starting daemon...
[+1414 ms] Initializing inputs
[ +504 ms] Reading cached asset graph...
[ +975 ms] Reading cached asset graph completed, took 970ms
[+8895 ms] Checking for updates since last build...
[+3488 ms] Checking for updates since last build completed, took 3.5s
[  +18 ms] Initializing inputs
[  +65 ms] Reading cached asset graph...
[  +11 ms] Reading cached asset graph completed, took 970ms
[   +2 ms] Checking for updates since last build...
[   +1 ms] Checking for updates since last build completed, took 3.5s
[+4523 ms] About to build [web]...
[  +13 ms] Running build...
[   +1 ms] Running build completed, took 237ms
[        ] Caching finalized dependency graph...
[  +51 ms] Caching finalized dependency graph completed, took 292ms
[   +1 ms] Succeeded after 540ms with 0 outputs (0 actions)
[  +53 ms] Building application for the web... (completed in 154.6s)
[   +1 ms] Attempting to connect to browser instance..
[+164908 ms] Attempting to connect to browser instance.. (completed in 164.7s, longer than expected)
[+4635 ms] "flutter run" took 331,511ms.
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.
#0      throwToolExit (package:flutter_tools/src/base/common.dart:27:3)
#1      _DwdsResidentWebRunner.run (package:flutter_tools/src/build_runner/resident_web_runner.dart:722:7)

#2      RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:548:37)

#3      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:638:18)
#4      _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:75:64)
#5      _rootRunUnary (dart:async/zone.dart:1134:38)
#6      _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#7      _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#8      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#9      Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#10     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#11     _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:34:15)
#12     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:293:13)
#13     RunCommand.usageValues (package:flutter_tools/src/commands/run.dart)
#14     _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:75:64)
#15     _rootRunUnary (dart:async/zone.dart:1134:38)
#16     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#17     _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#18     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#19     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#20     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#21     Future._asyncComplete. (dart:async/future_impl.dart:556:7)
#22     _rootRun (dart:async/zone.dart:1126:13)
#23     _CustomZone.run (dart:async/zone.dart:1023:19)
#24     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#25     _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23)
#26     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#27     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#28     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#29     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

C:\Users\hl\AndroidStudioProjects\hdt>flutter run --verbose -d chrome
[ +130 ms] executing: [C:\src\flutter\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[+4670 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +1 ms] fabeb2a16f1d008ab8230f450c49141d35669798
[   +1 ms] executing: [C:\src\flutter\flutter/] git describe --match v*.. --first-parent --long --tags
[+11165 ms] Exit code 0 from: git describe --match v*.. --first-parent --long --tags
[   +1 ms] v1.14.6-0-gfabeb2a16
[  +24 ms] executing: [C:\src\flutter\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +697 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[   +1 ms] origin/beta
[   +1 ms] executing: [C:\src\flutter\flutter/] git ls-remote --get-url origin
[ +342 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[ +414 ms] executing: [C:\src\flutter\flutter/] git rev-parse --abbrev-ref HEAD
[ +549 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] beta
[ +739 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[  +13 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +398 ms] executing: C:\Users\hl\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[+1005 ms] Exit code 0 from: C:\Users\hl\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[   +1 ms] List of devices attached
[  +22 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[+1804 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[   +5 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[   +3 ms] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[+2786 ms] Generating C:\Users\hl\AndroidStudioProjects\hdt\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +868 ms] Launching lib\main.dart on Chrome in debug mode...
[   +2 ms] Building application for the web...
[+134594 ms] Starting daemon...
[+1414 ms] Initializing inputs
[ +504 ms] Reading cached asset graph...
[ +975 ms] Reading cached asset graph completed, took 970ms
[+8895 ms] Checking for updates since last build...
[+3488 ms] Checking for updates since last build completed, took 3.5s
[  +18 ms] Initializing inputs
[  +65 ms] Reading cached asset graph...
[  +11 ms] Reading cached asset graph completed, took 970ms
[   +2 ms] Checking for updates since last build...
[   +1 ms] Checking for updates since last build completed, took 3.5s
[+4523 ms] About to build [web]...
[  +13 ms] Running build...
[   +1 ms] Running build completed, took 237ms
[        ] Caching finalized dependency graph...
[  +51 ms] Caching finalized dependency graph completed, took 292ms
[   +1 ms] Succeeded after 540ms with 0 outputs (0 actions)
[  +53 ms] Building application for the web... (completed in 154.6s)
[   +1 ms] Attempting to connect to browser instance..
[+164908 ms] Attempting to connect to browser instance.. (completed in 164.7s, longer than expected)
[+4635 ms] "flutter run" took 331,511ms.
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.
#0      throwToolExit (package:flutter_tools/src/base/common.dart:27:3)
#1      _DwdsResidentWebRunner.run (package:flutter_tools/src/build_runner/resident_web_runner.dart:722:7)

#2      RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:548:37)

#3      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:638:18)
#4      _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:75:64)
#5      _rootRunUnary (dart:async/zone.dart:1134:38)
#6      _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#7      _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#8      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#9      Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#10     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#11     _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:34:15)
#12     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:293:13)
#13     RunCommand.usageValues (package:flutter_tools/src/commands/run.dart)
#14     _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:75:64)
#15     _rootRunUnary (dart:async/zone.dart:1134:38)
#16     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#17     _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#18     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#19     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#20     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#21     Future._asyncComplete. (dart:async/future_impl.dart:556:7)
#22     _rootRun (dart:async/zone.dart:1126:13)
#23     _CustomZone.run (dart:async/zone.dart:1023:19)
#24     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#25     _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23)
#26     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#27     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#28     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#29     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

Can you please provide output from flutter run --verbose -d chrome? (the log output above indicates that the tool cannot decide between chrome and web-server).

C:\Users\hl\AndroidStudioProjects\hdt>flutter run --verbose -d chrome
[ +130 ms] executing: [C:\src\flutter\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[+4670 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +1 ms] fabeb2a
[ +1 ms] executing: [C:\src\flutter\flutter/] git describe --match v*.. --first-parent --long --tags
[+11165 ms] Exit code 0 from: git describe --match v*.. --first-parent --long --tags
[ +1 ms] v1.14.6-0-gfabeb2a16
[ +24 ms] executing: [C:\src\flutter\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +697 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[ +1 ms] origin/beta
[ +1 ms] executing: [C:\src\flutter\flutter/] git ls-remote --get-url origin
[ +342 ms] Exit code 0 from: git ls-remote --get-url origin
[ +1 ms] https://github.com/flutter/flutter.git
[ +414 ms] executing: [C:\src\flutter\flutter/] git rev-parse --abbrev-ref HEAD
[ +549 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[ +1 ms] beta
[ +739 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[ +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[ +13 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +398 ms] executing: C:\Users\hl\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[+1005 ms] Exit code 0 from: C:\Users\hl\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[ +1 ms] List of devices attached
[ +22 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[ +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[+1804 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[ +5 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[ +1 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[ +3 ms] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[+2786 ms] Generating C:\Users\hl\AndroidStudioProjects\hdt\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +868 ms] Launching lib\main.dart on Chrome in debug mode...
[ +2 ms] Building application for the web...
[+134594 ms] Starting daemon...
[+1414 ms] Initializing inputs
[ +504 ms] Reading cached asset graph...
[ +975 ms] Reading cached asset graph completed, took 970ms
[+8895 ms] Checking for updates since last build...
[+3488 ms] Checking for updates since last build completed, took 3.5s
[ +18 ms] Initializing inputs
[ +65 ms] Reading cached asset graph...
[ +11 ms] Reading cached asset graph completed, took 970ms
[ +2 ms] Checking for updates since last build...
[ +1 ms] Checking for updates since last build completed, took 3.5s
[+4523 ms] About to build [web]...
[ +13 ms] Running build...
[ +1 ms] Running build completed, took 237ms
[ ] Caching finalized dependency graph...
[ +51 ms] Caching finalized dependency graph completed, took 292ms
[ +1 ms] Succeeded after 540ms with 0 outputs (0 actions)
[ +53 ms] Building application for the web... (completed in 154.6s)
[ +1 ms] Attempting to connect to browser instance..
[+164908 ms] Attempting to connect to browser instance.. (completed in 164.7s, longer than expected)
[+4635 ms] "flutter run" took 331,511ms.
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.
#0 throwToolExit (package:flutter_tools/src/base/common.dart:27:3)
#1 _DwdsResidentWebRunner.run (package:flutter_tools/src/build_runner/resident_web_runner.dart:722:7)
#2 RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:548:37)
#3 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:638:18)
#4 _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:75:64)
#5 _rootRunUnary (dart:async/zone.dart:1134:38)
#6 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#7 _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#8 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#9 Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#10 Future._completeWithValue (dart:async/future_impl.dart:526:5)
#11 _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:34:15)
#12 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:293:13)
#13 RunCommand.usageValues (package:flutter_tools/src/commands/run.dart)
#14 _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:75:64)
#15 _rootRunUnary (dart:async/zone.dart:1134:38)
#16 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#17 _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#18 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#19 Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#20 Future._completeWithValue (dart:async/future_impl.dart:526:5)
#21 Future._asyncComplete. (dart:async/future_impl.dart:556:7)
#22 _rootRun (dart:async/zone.dart:1126:13)
#23 _CustomZone.run (dart:async/zone.dart:1023:19)
#24 _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#25 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23)
#26 _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#27 _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#28 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#29 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

flutter run -d Chrome
Waiting for another flutter command to release the startup lock...
Launching lib\main.dart on Chrome in debug mode...
Building application for the web...                               348.1s
Attempting to connect to browser instance..
526.7s (!)
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a
firewall.
I have this problem please help me.

**Problem: **
I am also facing same issue. I upgraded my flutter to latest beta version. After than when I try to run my app on Chrome, it throws this error:

Finished with error: Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.

Temporary Solution:
I also tried to use above listed cleaning methods (like: flutter clean), but it doesn't work. The last option left for me is to run my app on Web Server (web).
**Flutter Doctor Output for Reference: **
`E:>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version 10.0.18363.657], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Chrome - develop for the web
[√] Android Studio (version 3.5)
[√] VS Code (version 1.42.1)
[√] Connected device (2 available)
• No issues found!
`

C:\Users\alciomar.hollanda\Desktop\appti>flutter run --verbose -d chrome
[  +85 ms] executing: [C:\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +234 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +3 ms] 6815e72086ff925a74dc1d54fee8b0d38169ca8b
[        ] executing: [C:\flutter/] git describe --match v*.. --first-parent --long --tags
[ +838 ms] Exit code 0 from: git describe --match v*.. --first-parent --long --tags
[   +1 ms] v1.15.3-106-g6815e7208
[  +12 ms] executing: [C:\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +95 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/master
[        ] executing: [C:\flutter/] git ls-remote --get-url origin
[  +86 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[ +157 ms] executing: [C:\flutter/] git rev-parse --abbrev-ref HEAD
[  +90 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] master
[ +115 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[  +21 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +53 ms] executing: C:\SDKMANAGER\platform-tools\adb.exe devices -l
[ +639 ms] Exit code 0 from: C:\SDKMANAGER\platform-tools\adb.exe devices -l
[   +2 ms] List of devices attached
[  +31 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[  +20 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[+1551 ms] Generating
C:\Users\alciomar.hollanda\Desktop\appti\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +255 ms] Launching lib\main.dart on Chrome in debug mode...
[ +215 ms] Serving DevTools at http://<IP_ADDRESS>:54489
[   +8 ms] Updating assets
[ +552 ms] Syncing files to device Chrome...
[  +67 ms] Generating
C:\Users\alciomar.hollanda\Desktop\appti\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +458 ms] <- reset
[  +11 ms] C:\flutter\bin\cache\dart-sdk\bin\dart.exe
C:\flutter\bin\cache\artifacts\engine\windows-x64\frontend_server.dart.snapshot --sdk-root
C:\flutter\bin\cache\flutter_web_sdk/ --incremental --target=dartdevc -Ddart.developer.causal_async_stacks=true
--output-dill C:\Users\ALCIOM~1.HOL\AppData\Local\Temp\flutter_tool.76994fba-53db-11ea-a431-2c27d7a12dd9\app.dill
--packages C:\Users\alciomar.hollanda\Desktop\appti.packages -Ddart.vm.profile=false -Ddart.vm.product=false
--bytecode-options=source-positions,local-var-info,debugger-stops,instance-field-initializers,keep-unreachable-code,avoi
d-closure-call-instructions --enable-asserts --track-widget-creation --filesystem-root
C:\Users\ALCIOM~1.HOL\AppData\Local\Temp\flutter_tools.76994fbb-53db-11ea-a431-2c27d7a12dd9 --filesystem-scheme
org-dartlang-app --platform file:///C:/flutter/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk.dill
[  +15 ms] <- compile org-dartlang-app:///web_entrypoint.dart
[+30396 ms] Syncing files to device Chrome... (completed in 30.936ms, longer than expected)
[   +2 ms] Synced 20.9MB.
[   +1 ms] <- accept
[+30093 ms] "flutter run" took 64.643ms.
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for
example due to a firewall.
#0      throwToolExit (package:flutter_tools/src/base/common.dart:14:3)
#1      _ResidentWebRunner.run (package:flutter_tools/src/build_runner/resident_web_runner.dart:451:7)

#2      RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:563:37)

#3      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:681:18)
#4      _rootRunUnary (dart:async/zone.dart:1134:38)
#5      _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#6      _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#7      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#8      Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#9      Future._completeWithValue (dart:async/future_impl.dart:526:5)
#10     _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:34:15)
#11     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:293:13)
#12     RunCommand.usageValues (package:flutter_tools/src/commands/run.dart)
#13     _rootRunUnary (dart:async/zone.dart:1134:38)
#14     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#15     _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#16     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#17     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#18     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#19     Future._asyncComplete. (dart:async/future_impl.dart:556:7)
#20     _rootRun (dart:async/zone.dart:1126:13)
#21     _CustomZone.run (dart:async/zone.dart:1023:19)
#22     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#23     _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23)
#24     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#25     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#26     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#27     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

I'm also facing this problem but this problem exists only for first few attempts and then it runs successfully on Chrome.
Temporary solution that works for me:
• Keep attempting to build and run app on Chrome.
• After 2-3 attempts, you will get a successfully running web app on your Chrome.

Hi, I'm new to Android Development and Flutter and i had the same issue. when I'm running from the android studio the chrome will open but it won't show the components and i got the error message :
" Failed to establish a connection with the application instance in Chrome. This can happen if the WebSocket connection used by the web tooling is unable to correctly establish a connection, for example, due to a firewall" then I followed the procedure given in the link
https://flutter.dev/docs/get-started/web
with these steps, it solved my problem. May try this
Before doing this upgrade the dart SDK and the Android Studio.
I have the following config
$ Flutter --version
Flutter 1.14.6 • channel beta • https://github.com/flutter/flutter.git
Framework • revision fabeb2a16f (4 weeks ago) • 2020-01-28 07:56:51 -0800
Engine • revision c4229bfbba
Tools • Dart 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
I updated Android studio 3.6
then I changed the channel to beta
$ flutter channel beta
$flutter upgrade
If any error use $flutter upgrade --force
Then enable the web configuration
$flutter config --enable-web
then activate the web dev compiler for web
$pub global activate webdev
$flutter doctor -v
[√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version 10.0.18363.657], locale en-US)
• Flutter version 1.14.6 at C:\Flutter
• Framework revision fabeb2a16f (4 weeks ago), 2020-01-28 07:56:51 -0800
• Engine revision c4229bfbba
• Dart version 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at e:\android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-R, build-tools 29.0.2
• ANDROID_HOME = E:\Android\Sdk
• ANDROID_SDK_ROOT = E:\Android\Sdk;E:\Android\Sdk\tools;E:\Android\Sdk\platform-tools
• Java binary at: C:\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[√] Android Studio (version 3.6)
• Android Studio at C:\Android Studio
• Flutter plugin version 43.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
[√] Connected device (2 available)
• Chrome     • chrome     • web-javascript • Google Chrome 80.0.3987.122
• Web Server • web-server • web-javascript • Flutter Tools
• No issues found!
If there is no issue then run the following to clear the cache
$flutter clean
it will delete the dart and build folder
$flutter pub cache repair
it will update the packages list like this
Resetting Git repository for assets_for_android_views 0.1.0...
Downloading _discoveryapis_commons 0.1.9...
Downloading _fe_analyzer_shared 1.0.3...
Downloading analyzer 0.38.5...
Downloading analyzer 0.39.4...
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Reinstalled 194 packages.
Reactivating webdev 2.5.4...
Precompiling executables...
Precompiled webdev:webdev.
Installed executable webdev.
If you want to create a test web app run this
$ flutter create myapp(your app name)
If you have already a project and want to add web support to that package then run
$ flutter create .
open your pubspec.yaml file
under the dev_dependencies add the below buiild_runner and other three values
then run the packages get command on the top.
dev_dependencies:
build_runner: ^1.7.2
build_test: ^0.10.12
build_web_compilers: ^2.7.1
restart the IDE and check whether the web configuration is true using
$flutter config
Settings:
android-sdk: e:\android\sdk
enable-web: true
Analytics reporting is currently enabled.
Once it is true and If you want to debug using chrome run the following command
$flutter run -d chrome
Now my running sample screenshot is here,

same for me.
unfortunately flutter web is no longer useful until this issue resolves.

flutter upgrade solved this problem for me, however, did not update anything

I just tried flutter run -d chrome on Linux, Mac, and Windows, and it worked fine for me. I used the latest master branch (1d3fcfd6ca7e83c6c7d134fc99deb015839b0389).
We need to get more information about what's going on on these computers. @jonahwilliams any guesses? Can we add more instrumentation? For example, in verbose mode we could print the full Chrome command line that people could try running manually and testing the debug port (using e.g. telnet).

in master channel , I can use the code below without any problem on both android and ios , but today , I switched to beta channel and test it on chrome and it throw exception.
Future isInternetConnected({
  @required BuildContext context,
}) async {
  var result;
  try {
    result = await InternetAddress.lookup('google.com');
  } catch (e) {
    print(e);   // here  ********************
  }
  if (result.isNotEmpty && result[0].rawAddress.isNotEmpty) {
    if (showWaitingDialogInToDo) showWaitingDialog(context);
    return toDo();
  } else
    return toDoOnErrors();
}

Hello @yjbanov

Recently this error has happened to me too. I did a test on ten computers with Windows 10, even so the error happened in some moments.
Finally I thought it could be the version of Windows that could be causing the error, but it wasn't either.
In the last attempt I realized that when I ran “flutter run -d chrome” the flutter ran perfectly, but when I opened the visual code and tried to run it it showed the error. And if the visual code was open and tried to run the "flutter run -d chrome" by cmd, the error would appear.
I believe that the visual code makes some connection with the chrome that ends up blocking the execution.
I'm using the master branch

I'm using beta branch, facing the same problem.

any update ?

Disabling the firewall solved for me

I recently moved off master to beta (was having some firebase build issues on ios) but hadn't tried running with 'flutter run -d chrome --web-port 8000' in a while.  Now when I tried that I noticed that like someone else above, my url is weird:
http://[::1]:8000/#/
I have my CORS allowing localhost in, so this odd URL i suspect is hurting my http requests to my backend, but I haven't proven that.  Just figured I would ask here since someone else saw it.  Why is this URL so weird looking??

That URL is the IPv6 loopback address.

I tried out adding the following to the dev dependencies: as told by @EmptyMind2019 and the error resolved and I got the output.
just add the bottom three dependencies to pubspec.yaml
dev_dependencies:
build_runner: ^1.7.2
build_test: ^0.10.12
build_web_compilers: ^2.7.1

@Maverick099 i tried your solution but not working for me brother.

@Maverick099 .. i tried it too, but its not working :-(

Switched to master channel, solved problem for me. Now web is working.

I switched to master but still failed.
So, I tested out using flutter run --verbose -d chrome in cmd and VScode.
I observed that that app runs fine when I run in cmd, but fails when I either run from VScode alone or cmd with VScode open.
I also observed the build and launch operations execute fast with cmd, but with VScode, the operations stall at a point where it seems like some files are being synced to chrome.
These observations made me conclude that the problem is not with Flutter. It is either with VScode or my Firewall. Probably, something is going on under the hood that prevents VScode from syncing files with chrome.
So, I tried a trick. Although it's painful to work with, it worked for me.
In VScode I ran flutter run --release -d chrome
Yeah, I wasn't able to hot-reload, but I could hot-restart using that line. Painful.

I switched to master but still failed.
So, I tested out using flutter run --verbose -d chrome in cmd and VScode.
I observed that that app runs fine when I run in cmd, but fails when I either run from VScode alone or cmd with VScode open.
I also observed the build and launch operations execute fast with cmd, but with VScode, the operations stall at a point where it seems like some files are being synced to chrome.
These observations made me conclude that the problem is not with Flutter. It is either with VScode or my Firewall. Probably, something is going on under the hood that prevents VScode from syncing files with chrome.
So, I tried a trick. Although it's painful to work with, it worked for me.
In VScode I ran flutter run --release -d chrome
Yeah, I wasn't able to hot-reload, but I could hot-restart using that line. Painful.

I have same probleme

@iapicca  @VladyslavBondarenko
I tried the steps mentioned above but the problem still continues
$ flutter run --verbose -d chrome
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example
due to a firewall.
#0      throwToolExit (package:flutter_tools/src/base/common.dart:14:3)
#1      _ResidentWebRunner.run (package:flutter_tools/src/build_runner/resident_web_runner.dart:457:7)

#2      RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:563:37)

#3      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:711:18)
#4      _rootRunUnary (dart:async/zone.dart:1134:38)
#5      _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#6      _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#7      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#8      Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#9      Future._completeWithValue (dart:async/future_impl.dart:526:5)
#10     _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:34:15)
#11     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:293:13)
#12     RunCommand.usageValues (package:flutter_tools/src/commands/run.dart)
#13     _rootRunUnary (dart:async/zone.dart:1134:38)
#14     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#15     _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#16     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#17     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#18     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#19     Future._asyncComplete. (dart:async/future_impl.dart:556:7)
#20     _rootRun (dart:async/zone.dart:1126:13)
#21     _CustomZone.run (dart:async/zone.dart:1023:19)
#22     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#23     _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:965:23)
#24     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#25     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#26     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#27     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

@iapicca  @VladyslavBondarenko
I tried the steps mentioned above but the problem still continues
$flutter clean
$flutter pub cache repair
$ flutter run --verbose -d chrome

There is unfortunately a lot of misinformation on this bug now. To prevent people from wasting there time, I've hidden several unrelated comments.

This can happen if the websocket connection used by the web tooling is unabled to correctly establish a connection, for example due to a firewall.
👆👆Getting this error and I have tried all the solution mentioned above such as
Flutter clean
Flutter pub cache repair as mentioned by @iapicca
Please do reply this , because of this my project is at hold
do not unnecessarily close it.

@aditya-singh20  This has nothing to do with flutter clean or the pub cache, please do not post these suggestions.

@jonahwilliams do look above .... @iapicca suggest the way of flutter clean and if so the case do tell me the correct way ... I want to get it solved

@aditya-singh20  please do not post any more unless you have new information to contribute to the bug. You are not helping to solve the issue by repeating the same messages others have already posted, you are simply making harder to find the real information in this bug

Hi, I'm new to Android Development and Flutter and i had the same issue. when I'm running from the android studio the chrome will open but it won't show the components and i got the error message :
" Failed to establish a connection with the application instance in Chrome. This can happen if the WebSocket connection used by the web tooling is unable to correctly establish a connection, for example, due to a firewall" then I followed the procedure given in the link
https://flutter.dev/docs/get-started/web
with these steps, it solved my problem. May try this
Before doing this upgrade the dart SDK and the Android Studio.
I have the following config
$ Flutter --version
Flutter 1.14.6 • channel beta • https://github.com/flutter/flutter.git
Framework • revision fabeb2a (4 weeks ago) • 2020-01-28 07:56:51 -0800
Engine • revision c4229bfbba
Tools • Dart 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
I updated Android studio 3.6
then I changed the channel to beta
$ flutter channel beta
$flutter upgrade
If any error use $flutter upgrade --force
Then enable the web configuration
$flutter config --enable-web
then activate the web dev compiler for web
$pub global activate webdev
$flutter doctor -v
[√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version 10.0.18363.657], locale en-US)
• Flutter version 1.14.6 at C:\Flutter
• Framework revision fabeb2a (4 weeks ago), 2020-01-28 07:56:51 -0800
• Engine revision c4229bfbba
• Dart version 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at e:\android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-R, build-tools 29.0.2
• ANDROID_HOME = E:\Android\Sdk
• ANDROID_SDK_ROOT = E:\Android\Sdk;E:\Android\Sdk\tools;E:\Android\Sdk\platform-tools
• Java binary at: C:\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[√] Android Studio (version 3.6)
• Android Studio at C:\Android Studio
• Flutter plugin version 43.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
[√] Connected device (2 available)
• Chrome • chrome • web-javascript • Google Chrome 80.0.3987.122
• Web Server • web-server • web-javascript • Flutter Tools
• No issues found!
If there is no issue then run the following to clear the cache
$flutter clean
it will delete the dart and build folder
$flutter pub cache repair
it will update the packages list like this
Resetting Git repository for assets_for_android_views 0.1.0...
Downloading _discoveryapis_commons 0.1.9...
Downloading _fe_analyzer_shared 1.0.3...
Downloading analyzer 0.38.5...
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Downloading archive 2.0.11...
Downloading args 1.5.2...
Downloading assets_audio_player 1.2.3...
Downloading async 2.4.0...
Downloading audioplayer 0.5.2...
Downloading audioplayers 0.14.0...
Downloading battery 0.3.1+4...
Downloading bazel_worker 0.1.23...
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Downloading boolean_selector 1.0.5...
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Downloading built_value 6.8.2...
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Downloading charcode 1.1.2...
Downloading charcode 1.1.3...
Downloading checked_yaml 1.0.2...
Downloading code_builder 3.2.0...
Downloading code_builder 3.2.1...
Downloading collection 1.14.11...
Downloading collection 1.14.12...
Downloading completion 0.2.1+1...
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Downloading connectivity 0.4.5+3...
Downloading convert 2.1.1...
Downloading coverage 0.13.3+1...
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Downloading crypto 2.1.3...
Downloading crypto 2.1.4...
Downloading csslib 0.16.1...
Downloading cupertino_icons 0.1.2...
Downloading cupertino_icons 0.1.3...
Downloading dart_style 1.3.3...
Downloading device_info 0.4.1+1...
Downloading devtools 0.1.8-dev.1...
Downloading devtools 0.1.11...
Downloading devtools 0.1.15...
Downloading devtools_server 0.1.9...
Downloading devtools_server 0.1.12...
Downloading devtools_server 0.1.13...
Downloading dwds 0.7.9...
Downloading dwds 0.8.5...
Downloading dwds 1.0.1...
Downloading e2e 0.2.1+1...
Downloading file 5.1.0...
Downloading file_testing 2.1.0...
Downloading fixnum 0.10.11...
Downloading flutter_gallery_assets 0.1.9+2...
Downloading font_awesome_flutter 8.7.0...
Downloading front_end 0.1.27...
Downloading glob 1.2.0...
Downloading googleapis 0.54.0...
Downloading googleapis_auth 0.2.10...
Downloading graphs 0.2.0...
Downloading html 0.14.0+3...
Downloading http 0.12.0+2...
Downloading http 0.12.0+4...
Downloading http_multi_server 2.1.0...
Downloading http_multi_server 2.2.0...
Downloading http_parser 3.1.3...
Downloading image 2.1.4...
Downloading intl 0.16.0...
Downloading intl 0.16.1...
Downloading intl_translation 0.17.7...
Downloading io 0.3.3...
Downloading isolate 2.0.2...
Downloading js 0.6.1+1...
Downloading json_annotation 3.0.0...
Downloading json_annotation 3.0.1...
Downloading json_rpc_2 2.1.0...
Downloading kernel 0.3.27...
Downloading linter 0.1.101...
Downloading logging 0.11.3+2...
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Downloading matcher 0.12.6...
Downloading meta 1.1.8...
Downloading mime 0.9.6+3...
Downloading mockito 4.1.1...
Downloading multi_server_socket 1.0.2...
Downloading multicast_dns 0.2.2...
Downloading mustache 1.1.1...
Downloading native_stack_traces 0.2.2...
Downloading node_interop 1.0.3...
Downloading node_io 1.0.1+2...
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Downloading package_config 1.1.0...
Downloading package_resolver 1.0.10...
Downloading path 1.6.4...
Downloading path_provider 1.4.2...
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Downloading pedantic 1.8.0+1...
Downloading pedantic 1.9.0...
Downloading petitparser 2.4.0...
Downloading platform 2.2.1...
Downloading plugin 0.2.0+3...
Downloading pool 1.4.0...
Downloading process 3.0.12...
Downloading protobuf 1.0.1...
Downloading pub_semver 1.4.2...
Downloading pub_semver 1.4.3...
Downloading pubspec_parse 0.1.5...
Downloading quiver 2.0.5...
Downloading quiver 2.1.2+1...
Downloading rxdart 0.23.1...
Downloading scoped_model 1.0.1...
Downloading scratch_space 0.0.4+1...
Downloading scratch_space 0.0.4+2...
Downloading shelf 0.7.5...
Downloading shelf_packages_handler 1.0.4...
Downloading shelf_proxy 0.1.0+7...
Downloading shelf_static 0.2.8...
Downloading shelf_web_socket 0.2.3...
Downloading shrine_images 1.1.2...
Downloading source_gen 0.9.4+6...
Downloading source_map_stack_trace 1.1.5...
Downloading source_maps 0.10.8...
Downloading source_maps 0.10.9...
Downloading source_span 1.5.5...
Downloading source_span 1.6.0...
Downloading sse 2.1.2...
Downloading sse 3.1.1...
Downloading sse 3.1.2...
Downloading stack_trace 1.9.3...
Downloading stream_channel 2.0.0...
Downloading stream_transform 0.0.20...
Downloading stream_transform 1.1.0...
Downloading string_scanner 1.0.5...
Downloading sync_http 0.1.4...
Downloading sync_http 0.2.0...
Downloading term_glyph 1.1.0...
Downloading test 1.9.4...
Downloading test 1.12.0...
Downloading test_api 0.2.11...
Downloading test_api 0.2.14...
Downloading test_core 0.2.15...
Downloading test_core 0.3.0...
Downloading timing 0.1.1+2...
Downloading typed_data 1.1.6...
Downloading url_launcher 5.2.5...
Downloading url_launcher_platform_interface 1.0.1...
Downloading usage 3.4.1...
Downloading uuid 2.0.2...
Downloading uuid 2.0.4...
Downloading vector_math 2.0.8...
Downloading video_player 0.10.2+5...
Downloading vm_service 1.2.0...
Downloading vm_service_client 0.2.6+2...
Downloading watcher 0.9.7+12...
Downloading watcher 0.9.7+13...
Downloading web_socket_channel 1.1.0...
Downloading webdev 2.5.4...
Downloading webdriver 2.1.1...
Downloading webdriver 2.1.2...
Downloading webkit_inspection_protocol 0.5.0...
Downloading xml 3.5.0...
Downloading yaml 2.2.0...
Reinstalled 194 packages.
Reactivating webdev 2.5.4...
Precompiling executables...
Precompiled webdev:webdev.
Installed executable webdev.
If you want to create a test web app run this
$ flutter create myapp(your app name)
If you have already a project and want to add web support to that package then run
$ flutter create .
open your pubspec.yaml file
under the dev_dependencies add the below buiild_runner and other three values
then run the packages get command on the top.
dev_dependencies:
build_runner: ^1.7.2
build_test: ^0.10.12
build_web_compilers: ^2.7.1
restart the IDE and check whether the web configuration is true using
$flutter config
Settings:
android-sdk: e:\android\sdk
enable-web: true
Analytics reporting is currently enabled.
Once it is true and If you want to debug using chrome run the following command
$flutter run -d chrome
Now my running sample screenshot is here,

This worked for me. But I had to run "flutter build web" first, before running flutter run -d chrome.  Also, this worked only in the command mode so far. Good enough for me .  Hope the team resolves all errors soon

any progress from flutter team ?

to switch master channel working for me

Thank you. These steps solved the problem for me too.
$flutter clean
$flutter pub cache repair
$flutter run --verbose -d chrome

I had this issue when upgrading from dev channel to master channel.
what i did to solve this problem is, clean my project's build cache (flutter clean), then run the project using release mode.
After that, i can run it on debug mode.
i don't know why this method could fix the problem tho.

flutter run -d chrome --release
running in release mode is the solution to this problem

Disabling the firewall solved for me

Yes it worked for me too

following command work for me. Please check and let me know
flutter channel beta
flutter upgrade
flutter config --enable-web
flutter run -d chrome --release

This needs to be fixed:
No matter if you're using the beta or dev channel, cleaned or not....
Using flutter run -d chrome --release is indeed the solution.

This needs to be fixed...
No matter if you're using the beta or dev channel, cleaned or not....
Using flutter run -d chrome --release is indeed the solution.

Partiallly the solution because "print" doesn't work, if you need to test, see some variable value without showing inside a Widget, you can't use print if you "flutter run" with --release flag.

I am having same issues, it was working fine using Chrome release mode, but from Today it started again acting up.

Someone please help. This issue makes so frusturated.
i have tried;

flutter clean,
flutter pub cache repair,
switching to master channel,
disabling firewall

but nothing worked. please help...

flutter run -d chrome --release
running in release mode is the solution to this problem

Yeah but debugging is just right. How will I know what and where is the error

flutter run -d chrome --release
running in release mode is the solution to this problem

thank you!!

I found a temporary solution; maybe it's work for you too.
Solution:-
flutter clean
If this won't work then open Chrome > settings > Privacy and Security > security > then in safe Browsing choose No protection (not recommended)
Maybe this will fix

I found a temporary solution; maybe it's work for you too.
Solution:-
flutter clean
If this won't work then open Chrome > settings > Privacy and Security > security > then in safe Browsing choose No protection (not recommended)
Maybe this will fix

It only happens when you run the project for the first time (debug mode), the second it works fine.

I found a temporary solution; maybe it's work for you too.
Solution:-
flutter clean
If this won't work then open Chrome > settings > Privacy and Security > security > then in safe Browsing choose No protection (not recommended)
Maybe this will fix

It only happens when you run the project for the first time (debug mode), the second it works fine.

Yes, running 2nd time flutter run -d chrome command after flutter clean works.

'flutter run -d chrome' use this command to run your web app instead of f5 in vscode for windows. It works fine for me.

Hi @umair-ilyas
I'm glad that you solved the issue,
when upgrading version or changing channel
it's generally a good idea to run flutter clean
and if needed flutter pub cache repair;
I believe there's no action to be taken.
Closing this issue,
if you disagree please write in the comments and I will reopen it
Thank you

I could solve my problem using flutter clean.
Thanks

this thing comes every time i reopens vs code

I'm new to flutter development and trying to use the web option to run my app but getting the following error:
Launching lib\main.dart on Chrome in debug mode...
Syncing files to device Chrome...                                  34.3s
Failed to establish connection with the application instance in Chrome.
This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example
due to a firewall.
**I also tried to use above listed cleaning methods (like: flutter clean), but it doesn't work, please help @iapicca
**Sharing the flutter doctor output:
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, 1.24.0-4.0.pre.57, on Microsoft Windows [Version 10.0.18362.1016], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[√] Chrome - develop for the web
[√] Android Studio (version 4.1.0)
[√] VS Code (version 1.50.1)
[√] Connected device (3 available)
• No issues found!
**Also sharing the chrome console output:
Failed to load resource: net::ERR_CONNECTION_RESET
DevTools failed to load SourceMap: Could not load content for http://localhost:54367/web_entrypoint.dart.lib.js.map: Connection error: net::ERR_CONNECTION_REFUSED
DevTools failed to load SourceMap: Could not load content for http://localhost:54367/packages/app_one/main.dart.lib.js.map: Connection error: net::ERR_CONNECTION_REFUSED
DevTools failed to load SourceMap: Could not load content for http://localhost:54367/packages/flutter/src/material/app.dart.lib.js.map: Connection error: net::ERR_CONNECTION_REFUSED
DevTools failed to load SourceMap: Could not load content for http://localhost:54367/packages/flutter/src/widgets/icon.dart.lib.js.map: Connection error: net::ERR_CONNECTION_REFUSED

its mostly nothing to do with flutter but, 'its either because you have log your computr in safe mode' -----In my case shift key was stucked and i had no idea i was in safemode.
'Or else You need to check your firewall" --system preferances>security and privacy>>firewall --click the lock below and enter your system password --and then click firewall option enter image description here --In there add your editor to allow internet connection (android studio Or VsCode)

I'm so thankful that you consider replying 👍🏻
But I use windows 10
So can you please give me these following steps for that
I'll be truly grateful!!
On Wed, 18 Nov, 2020, 11:56 am Kamlesh Paikrao<EMAIL_ADDRESS>wrote:

its mostly nothing to do with flutter but, 'its either because you have
log your computr in safe mode' -----In my case shift key was stucked and i
had no idea i was in safemode.
'Or else You need to check your firewall" --system preferances>security
and privacy>>firewall --click the lock below and enter your system password
--and then click firewall option enter image description here --In there
add your editor to allow internet connection (android studio Or VsCode)
[image: Screenshot 2020-11-18 at 11 48 02 AM]
https://user-images.githubusercontent.com/48256604/99493359-11c63380-2995-11eb-98a9-9544f842443d.png
—
You are receiving this because you commented.
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.

SOLUTION FOUND!
if you are in windows 10:

steps:

go to windows security.

click on App & browser control.

go to reputation-based protection settings

TURN OFF "Check apps and files"
                                  _happy coding!!_

its mostly nothing to do with flutter but, 'its either because you have log your computr in safe mode' -----In my case shift key was stucked and i had no idea i was in safemode.
'Or else You need to check your firewall" --system preferances>security and privacy>>firewall --click the lock below and enter your system password --and then click firewall option enter image description here --In there add your editor to allow internet connection (android studio Or VsCode)

I did this configuration, restarted and the problem persists. Only after some tries with flutter run it works or in release mode (in release mode works everytime).

I'm also facing this problem but this problem exists only for first few attempts and then it runs successfully on Chrome.
Temporary solution that works for me:
• Keep attempting to build and run app on Chrome.
• After 2-3 attempts, you will get a successfully running web app on your Chrome.

Thank you sir ,
it worked for me actually for those who got this on first run on master channel for web can utilize this soln thanks a lot sir

Tried this... but still isn't working
Please help!

2.
click on App & browser control.
3.
go to reputation-based protection settings
4.
TURN OFF "Check apps and files"
                                 _happy coding!!_

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Reply to this email directly, view it on GitHub
https://github.com/flutter/flutter/issues/49482#issuecomment-741898052,
or unsubscribe
https://github.com/notifications/unsubscribe-auth/AL7YR43FXKYHZARX7I2YTKTST6SXJANCNFSM4KLRBYKA
.

I've try all of this .. and still not working ..
it's just working in terminal when running it on release mode  .. but no actually action on editor when save the code .. it must refresh it from terminal !
and most of times the terminal crashed too!

Tried everything mentioned above but doesn't work
End up running this in my terminal and able to connect localhost:8080 in chrome browser now with Dart Debug Extension working
flutter run -d web-server --web-port 8080 --web-hostname <IP_ADDRESS>

Hello, I am having a relative issue.
When I run on normal mode I get this error:
Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a    firewall.
but, when I run on release mode my application successfully runs.
I have tried:

upgrading
cache repair

Does anyone have a solution?
Thanks in advance!

Hello, I am having a relative issue.
When I run on normal mode I get this error:
Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a    firewall.
but, when I run on release mode my application successfully runs.
I have tried:

upgrading
cache repair

Does anyone have a solution?
Thanks in advance!

Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall
I get the same issue when running web project built in flutter.
I tried cleaning and changing the channels
Nothing happened. Same error occurs every time.

Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall
I get the same issue when running web project built in flutter.
I tried cleaning and changing the channels
Nothing happened. Same error occurs every time.

Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall
Flutter'da yerleşik web projesini çalıştırırken de aynı sorunu yaşıyorum. Hiçbir şey olmadı ve değiştirmeyi

If this won't work then open Chrome > settings > Privacy and Security > security > then in safe Browsing choose No protection (not recommended)
this solution work for me try this

Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall
Flutter'da yerleşik web projesini çalıştırırken de aynı sorunu yaşıyorum. Hiçbir şey olmadı ve değiştirmeyi

If this won't work then open Chrome > settings > Privacy and Security > security > then in safe Browsing choose No protection (not recommended)
this solution work for me try this

/cc @grouma

/cc @grouma

based on this comment :
https://github.com/flutter/flutter/issues/49482#issuecomment-592558911
add some fix in the step when "activate pub"
$flutter pub cache repair
$flutter pub global activate webdev

Why are folks activating webdev? This is not a required dependency for Flutter Web development.
cc @jonahwilliams if we have some stale documentation.
I'm struggling to reproduce this issue in any of my environments. If someone is able to reliably reproduce this problem please each out.

@grouma i am looking for documentation that explains how to configure window firewall to allow communications to the AVD.
Background:  on first startup from VSCode terminal (i.e. flutter run) Windows firewall prompt me, but I haven't the admin access, so I need to abort.  Subsequent startup no longer provide the prompt.  What is the firewall config? or where is this setup cached?  I already try flutter clear but no go. Thank you!

@grouma i am looking for documentation that explains how to configure window firewall to allow communications to the AVD.
Background: on first startup from VSCode terminal (i.e. flutter run) Windows firewall prompt me, but I haven't the admin access, so I need to abort. Subsequent startup no longer provide the prompt. What is the firewall config? or where is this setup cached? I already try flutter clear but no go. Thank you!

FYI... i have found this documentation on Android site about firewall config... https://developer.android.com/studio/run/emulator-networking

These rules sit outside of Flutter. I'm not totally familiar with them but this thread may be of use: https://superuser.com/questions/1154812/how-to-re-trigger-windows-firewall-has-blocked-message

Failed to establish connection with the application instance in Chrome.

after
flutter clean
flutter pub cache repair

remember to check your host config:
<IP_ADDRESS>	localhost

Just install the Dart Debug Extension for Chrome and everything is running fine

Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall
I get the same issue when running web project built in flutter.
I tried cleaning and changing the channels
Nothing happened. Same error occurs every time.

https://stackoverflow.com/a/64888060/12387293

There might be some error in the index.html file under the web directory.
In my case, I was using firebase-messaging-sw.js (service worker)

After commenting it worked.

I see many of you encountering this issue while upgrading. But this is also a problem with a fresh install.
I installed the latest flutter version(first time installation, not upgrade) and the same issue is happening.
Currently, only two solutions work:

Run in release mode
added with the lack of hot-reload, this is painful wait-time when restarting(hot restart) the app
Run with web-server
You have to hot restart and manually refresh the browser page for every change

Please do something about this!

Since this issue is somewhat a catch-all it's possibly related to https://github.com/dart-lang/http_multi_server/issues/35. Note there is a fix out https://github.com/dart-lang/http_multi_server/pull/36

Guys, I get it running now.
I followed the manual from stackoverflow.com

Run as release mode
Run as debug mode
It works now.
No need to add VS Code in Windows Firewall.

If you are using Firebase features, you need to add specific FirebaseJS from this link inside index.html file. Otherwise it won't run and it will display above error.

So I switched to master channel(version 2.2.0-10.1.pre) and run the app there. To my amazement, this error was never to be seen! The app started perfectly.
@grouma Is there any reason relating what you mentioned to  why it worked when switched to master channel?
@gOzaru I don't think so because I can see other people running it in debug mode on first try.

The master channel depends on the latest http_multi_server which contains the fix mentioned above. It's possible this is now resolved. Closing for now. Feel free to re-open with additional details if you run into it again.

@grouma  I am a little confused here. Isn't http_multi_server a third-party package? Why does the master channel depend on it for running the app?

Flutter Tools, and transitively package:dwds, depends on it for building and serving your application.

@grouma  oh I see. Thanks for the reply.
What version of http_multi_server is the stable channel  using now? Is there any info out there that tells what each channel's dependencies are and their version(except for Dart of course)?

If you look at the pubspec.yaml in the Flutter Tools directory it should list the package dependencies and their versions.

Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall
I get the same issue when running web project built in flutter.
I tried cleaning and changing the channels
Nothing happened. Same error occurs every time.

try "flutter run -d chrome --release"
it helped me.
if you use edge
flutter run -d edge --release

@grouma Great! Thanks for help.

I got this problem when I was actually trying to run it in emulator. I then launched emulator from terminal and then ran the debug. I did this -
flutter emulators
flutter emulators --launch <emulator id>

<IP_ADDRESS>	localhost

Thank you for saving my time this is worked for me

in my case, the issue was solved when I removed enableFlutterDriverExtension call from main, which I used to implement UI testing for mobile platforms.

In my project, I'm using Flutter version 2.0.1 and Dart version 2.12.0.
Suddenly from 11th May, I'm unable to run my project in debug mode with Chrome(web) as the target device in Android Studio.
I'm getting the following error:
"Failed to establish connection with the application instance in Chrome. This can happen if the websocket connection used by the web tooling is unable to correctly establish a connection, for example due to a firewall."
My device specification:
Apple MacBook Pro M1, running on MacOS Ventura 13.3.1 (a)
Google Chrome version: Version 113.0.5672.92 (Official Build) (arm64)
Note that, I'm able to run in release mode using Chrome(web), but not in debug mode.
I'm also able to run in web server, but that is difficult to work with while development and debugging.
My MacBook's firewall is disabled and the network doesn't have a proxy.
Also, I've tried changing the port from default (8080) to some other port, but still getting the same error.
Also, the problem is not with the IDE, because I'm getting the same error in VSCode.
I've tried all the solutions in stack overflow and in this GitHub issues thread, except for the "flutter upgrade" command (because my codebase is in Flutter 2.0.1 and I cannot afford to update it now).
It is worth mentioning that, I've created a new Flutter project using Flutter version 3.3.4, and the app was running with Chrome(web) in debug mode.
P.S.: 11th May is the day after Google IO event, where they released Flutter version 3.10 and new Dart version as well.
Please find below my flutter doctor log:
`[✓] Flutter (Channel stable, 2.0.1, on macOS 13.3.1 22E772610a darwin-arm, locale en-GB)
• Flutter version 2.0.1 at /Users/kaushik/Development/flutter/flutter_2.0.1
• Framework revision c5a4b4029c (2 years, 2 months ago), 2021-03-04 09:47:48 -0800
• Engine revision 40441def69
• Dart version 2.12.0
[!] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
• Android SDK at /Users/kaushik/Library/Android/sdk
• Platform android-32, build-tools 32.1.0-rc1
• Java binary at: /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
• Java version Java(TM) SE Runtime Environment (build 1.8.0_351-b10)
! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 14.1, Build version 14B47b
• CocoaPods version 1.12.1
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[!] Android Studio (version 2021.2)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
✗ Unable to find bundled Java version.
• Try updating or re-installing Android Studio.
[✓] Connected device (1 available)
• Chrome (web) • chrome • web-javascript • Google Chrome 113.0.5672.92
! Doctor found issues in 2 categories.`
Please someone help me out here.
Thanks in advance.


Fix box blur symmetry & simplify code

Previous version of box blur kernel was asymmetrical, because the leftmost and topmost pixels were subtracted from the average values too early, causing the image to offset by GAUSSIAN_BLUR_ITERATIONS pixels after blurring. You can see this at the rightmost and bottommost borders of the image. This commit fixes this bug.

Original image
Old box blur
Fixed box blur

Image is also a bit more blurry now since the blur kernel is now 1 pixel wider.
PS. Perhaps GAUSSIAN_BLUR_ITERATIONS could be a function argument rather than a predefined value?

@rmn20 Nice! Great improvement! Actually I didn't notice the issue with previous implementation, but not it looks way better! Thanks!

@raysan5 You can see the offset issue with previous implementation much more obviously, if you apply box blur several times.
For example, here I've applied box blur with radius 1 three times:

Original image
Old box blur
Fixed box blur


Metadata enhancement - link image with GitHub repo version

I use "created" meta data and I really like it. I was thinking if you could change the build process to include also an attribute reflecting the relation between the GitHub repository state (perhaps Commit Number ???) and the image version.
I suppose we could identify better the version we are running currently.

Good idea
We will try to find an automated way of doing this when we lift the build into our build system.

I hope this could minimize questions like: "Has been included this fix or feature in the version I am currently running on?"

Maybe add a URL to a TAG like
https://github.com/Microsoft/nav-docker/tree/<IP_ADDRESS>

Yes, this is far better than using the commit number. Of course, you need to start tagging. But I suppose this shouldn`t be a problem.

Confirmed. The tag labels appear in currently pulled images. For example:
docker inspect --format "{{ index .Config.Labels }}" navdocker.azurecr.io/dynamics-nav:devpreview-finus

tag:<IP_ADDRESS> version:11.0.18246.0 country:finus created:201708312013 cu:september legal:http://go.microsoft.com/fwlink/?LinkId=837447 maintainer:Freddy Kristiansen nav:devpreview