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Debugging a .NET Core project in VS 2017 - Unable to start program, An operation is not legal in the current state

When trying to debug a .NET Core application using Visual Studio 2017, attaching the debugger suddenly started to fail with the following error message:

Unable to start program, An operation is not legal in the current state

Starting without a debugger attached worked, but attaching the debugger later on didn’t. Rebuilding my project, restarting Visual Studio, restarting my PC, all seemed to not bring a solution to the table.

This is a known issue, the solution (workaround) is to turn off JavaScript debugging on Chrome:

  • Go to Tools –> Options –> Debugging –> General
  • Turn off the setting for Enable JavaScript Debugging for ASP.NET (Chrome and IE)

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Remark: A fix will be provided in the Visual Studio 2017 15.6 release.

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