The Angular CLI process did not start listening for requests within the timeout period of 0 seconds

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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When upgrading our Angular 8 project to Angular 9 this became an issue. Before the upgrade the project was running just fine.

Visual Studio Enterprise 2019 Version 16.5.5 (Windows 10 - 1903)

.NET Core 3.1

Angular 9.1.9

It seems to be an issue that is active for some months now, but all the solutions seems to be a workaround and not an actual fix:

https://github.com/angular/angular-cli/issues/16961

https://stackoverflow.com/questions/55406292/timeoutexception-the-angular-cli-process-did-not-start-listening-for-requests-w

We've tried to edit the package.json and updated "start": "ng serve", to "start": "ng serve --host 0.0.0.0",

This seems to fix the issue if you're using 'Start without Debugging', but when you use 'Start Debugging' it fails again.

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Original Comments

Visual Studio Feedback System on 6/9/2020, 03:07 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

(no solutions)

[mkArtakMSFT]

Potentially related to #17277 and #18820

[mkArtakMSFT]

This is a dupe of #18062

[Knordy]

The edit in #17277 ("start": "echo hello && ng serve",) seems to be a valid workaround for now. Will monitor it and reply if it fails again.

We are using UseAngularCliServer and not UseProxyToSpaDevelopmentServer as #18062 is suggesting, but could have potentialy similar underlying issues.

Still hope this gets fixed.

[Knordy]

Unfortunately start": "echo hello && ng serve isn't a stable workaround. It still produces the mentioned error.

It show the following message in the debug output window:
Exception thrown: 'System.TimeoutException' in System.Private.CoreLib.dll

[Knordy]

So I've tried several things now, as what is indicated in #18820

• removing aspnet-prerendering, as it seems to be deprecated ([Announcement] Obsoleting Microsoft.AspNetCore.SpaServices and Microsoft.AspNetCore.NodeServices #12890)
• Updating Microsoft.AspNetCore.SpaServices.Extensions to 3.1.5
• using echo Starting... && ng serve --host 0.0.0.0

All fails when using Start Debugging in Visual Studio. So the only possible fix is the suggested fix in the AngularCliMiddleWare as suggested in #18062?