Failed to launch debug adapter: VS tries to connect to a random port

user_961631 0
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I have a asp.net core (.net5) project that when I launch it systematically throws errors after a delay, and then closes the debug.

I have the following launchSettings:

{
  "iisSettings": {
    "windowsAuthentication": true,
    "anonymousAuthentication": false,
    "iisExpress": {
      "applicationUrl": "http://localhost:50868",
      "sslPort": 44363
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "Kestrel": {
      "commandName": "Project",
      "dotnetRunMessages": "true",
      "launchBrowser": true,
      "applicationUrl": "https://localhost:5001;http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

I launch the project in debug mode as "Kestrel"

One or more errors occurred.

Failed to launch debug adapter. Additional information may be available in the output window.

Cannot connect to runtime process, timeout after 10000 ms - (reason: Cannot connect to the target: connect ECONNREFUSED 127.0.0.1:55743).

enter image description here

It seems it does try to connect to a random port like 127.0.0.1:55743 when the project is set to launch the browser at https://localhost:5001 or 5000 enter image description here

Seems related to this issue https://github.com/dotnet/aspnetcore/issues/28113

PS. The debug is working fine with Edge (I usually work in Chrome), I suppose there is need to change the browser if you have such issue....

.net-5 visual-studio-2019 asp.net-core visual-studio .net
1 Answers

I tried several solutions, not sure what one really helped, but you can try one the following:

  • Disable/Enable JavaScript Debugging in VS options: enter image description here

  • Change the default launch browser to see if it helps (say, launch in Edge or Firefox instead of Chrome)

  • uncheck the "launchbrowser" in the project debug settings, launch the debug and then open manually your startup link (localhost or other you configured to launch)

  • open your resources monitor and check if the port you try to open is not already taken by another process (open TaskManager, go to Performance tab and in the bottom ov the window you have the resources monitor. Alternatively launch the "resmon.exe" from command line. Then go to network tab and the last "Ports".

user_9616310
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