Microsoft Visual Studio Failed to launch debug adapter 'Microsoft.VisualStudio.Shared.VSCodeDebugProtocol.ProtocolException

Describe the bug

I am trying to upgrade my .net core 3.1 based solution to .net 5.0. I am seeing this error with:

• Microsoft Visual Studio Professional 2019 Version 16.8.2
• Microsoft Visual Studio 2019 Community version 16.9 Preview 1

Attempting to launch my asp.net core project with visual studio debugger fails:

Looking in output window I got a path to the verbose output log, and here is the relevent info:

{"tag":"runtime.launch","timestamp":1606227038803,"message":"Launch returned error","metadata":{"error":{"message":"Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md\n\"","stack":"Error: Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md\n\"\n at k.prepareLaunch (c:\\program files (x86)\\microsoft visual studio\\2019\\preview\\common7\\ide\\commonextensions\\microsoft\\jsdiagnostics\\debugger\\debugAdapter\\out\\src\\targets\\browser\\browserLauncher.js:102:19)\n at processTicksAndRejections (internal/process/task_queues.js:97:5)"},"wasCancelled":false,"name":"k"},"level":2} {"tag":"dap.send","timestamp":1606227041361,"metadata":{"connectionId":0,"message":{"seq":16,"type":"response","request_seq":2,"command":"launch","success":false,"body":{"error":{"id":9240,"format":"Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md\n\"","showUser":false}}}},"level":0} {"tag":"dap.send","timestamp":1606227043301,"metadata":{"connectionId":0,"message":{"seq":17,"type":"event","event":"output","body":{"category":"telemetry","output":"js-debug/dap/operation","data":{"errors":[],"initialize":{"operation":"initialize","totalTime":4.5,"max":4.5,"avg":4.5,"stddev":null,"count":1,"failed":0},"!initialize.errors":[],"initialize.errors":[],"setBreakpoints":{"operation":"setBreakpoints","totalTime":11.3,"max":2,"avg":1.3,"stddev":0.5,"count":9,"failed":0},"!setBreakpoints.errors":[],"setBreakpoints.errors":[],"setExceptionBreakpoints":{"operation":"setExceptionBreakpoints","totalTime":0.5,"max":0.5,"avg":0.5,"stddev":null,"count":1,"failed":0},"!setExceptionBreakpoints.errors":[],"setExceptionBreakpoints.errors":[],"configurationDone":{"operation":"configurationDone","totalTime":0.5,"max":0.5,"avg":0.5,"stddev":null,"count":1,"failed":0},"!configurationDone.errors":[],"configurationDone.errors":[],"launch":{"operation":"launch","totalTime":2932.4,"max":2932.4,"avg":2932.4,"stddev":null,"count":1,"failed":1},"!launch.errors":[{"error":{"message":"Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md\n\"","name":"Error","stack":"Error: Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: httptroubleshooting.md\n\"\n at k.prepareLaunch (c:browserLauncher.js:102:19)\n at processTicksAndRejections (internaltask_queues.js:97:5)"}}],"launch.errors":[{"error":{"message":"Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md\n\"","name":"Error","stack":"Error: Unable to launch browser: \"Failed to launch browser!\n\n\nTROUBLESHOOTING: httptroubleshooting.md\n\"\n at k.prepareLaunch (c:browserLauncher.js:102:19)\n at processTicksAndRejections (internaltask_queues.js:97:5)"}}]}}}},"level":0} {"tag":"dap.send","timestamp":1606227043419,"metadata":{"connectionId":0,"message":{"seq":18,"type":"event","event":"output","body":{"category":"telemetry","output":"js-debug/error","data":{"!error":{"error":{"message":"read ECONNRESET","name":"Error","stack":"Error: read ECONNRESET\n at TCP.onStreamRead (internal/stream_base_commons.js:205:27)"}},"error":{"error":{"message":"read ECONNRESET","name":"Error","stack":"Error: read ECONNRESET\n at TCP.onStreamRead (internal/stream_base_commons.js:205:27)"}},"exceptionType":"uncaughtException"}}}},"level":0} {"tag":"dap.send","timestamp":1606227043419,"message":"Message not sent. Connection was closed.","level":2} {"tag":"runtime.exception","timestamp":1606227043419,"message":"Unhandled error in debug adapter","metadata":{"message":"read ECONNRESET","stack":"Error: read ECONNRESET\n at TCP.onStreamRead (internal/stream_base_commons.js:205:27)"},"level":3}

Here is the relevent section from my launchProfiles.json:

 "MyHost": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "https://localhost:62808/",
      "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}",
      "applicationUrl": "http://localhost:62807/;https://localhost:62808/;",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },

Note: if I change launchBrowser to false I can successfully start the project, and then open the browser and navigate to the url manually.

Other Note:

Edge is my default browser. When this error occurs, it seems a new empty Edge window is created:

To Reproduce

As per above that’s the best I can do at present.

Exceptions (if any)

See screenshots and logs above.

Further technical details

• ASP.NET Core version: .net 50
• Include the output of dotnet --info

.NET SDK (reflecting any global.json):
 Version:   5.0.100
 Commit:    5044b93829

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19042
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.100\

Host (useful for support):
  Version: 5.0.0
  Commit:  cf258a14b7

.NET SDKs installed:
  1.1.13 [C:\Program Files\dotnet\sdk]
  2.1.502 [C:\Program Files\dotnet\sdk]
  2.1.503 [C:\Program Files\dotnet\sdk]
  2.1.504 [C:\Program Files\dotnet\sdk]
  2.1.505 [C:\Program Files\dotnet\sdk]
  2.1.507 [C:\Program Files\dotnet\sdk]
  2.1.508 [C:\Program Files\dotnet\sdk]
  2.1.509 [C:\Program Files\dotnet\sdk]
  2.1.511 [C:\Program Files\dotnet\sdk]
  2.1.512 [C:\Program Files\dotnet\sdk]
  2.1.513 [C:\Program Files\dotnet\sdk]
  2.1.514 [C:\Program Files\dotnet\sdk]
  2.1.515 [C:\Program Files\dotnet\sdk]
  2.1.516 [C:\Program Files\dotnet\sdk]
  2.1.519 [C:\Program Files\dotnet\sdk]
  2.1.600 [C:\Program Files\dotnet\sdk]
  2.1.602 [C:\Program Files\dotnet\sdk]
  2.1.800 [C:\Program Files\dotnet\sdk]
  2.2.101 [C:\Program Files\dotnet\sdk]
  3.0.100 [C:\Program Files\dotnet\sdk]
  3.1.102 [C:\Program Files\dotnet\sdk]
  3.1.201 [C:\Program Files\dotnet\sdk]
  3.1.402 [C:\Program Files\dotnet\sdk]
  5.0.100-rc.1.20452.10 [C:\Program Files\dotnet\sdk]
  5.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.19 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.19 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0-rc.1.20451.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 1.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0-rc.1.20451.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0-rc.1.20452.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

• The IDE (VS / VS Code/ VS4Mac) as per above

[andrewsmalek]

I’ve tried all the above solutions and nothing worked for me.

However, Disabling “Script Debugging” seems to fix the issue for me. Update: as mentioned by RNONGFU001, make sure to end the active task for your browser first (chrome, edge…etc.).

[vnbaaij]

What fixes this for me is:

• Close Visual Studio
• Delete the “debuggerConfiguration-{guid}.json” file from the “{solution}\.vs\{solutionname}\config\” folder .
• Start Visual Studio and happy debugging!