HTTP 500 error with ASP.NET Core application on IIS Express 10

Numirani

I believe I have narrowed it down to a misconfiguration, but I can't find where the error lies.

Steps to reproduce:

  • Created a new project in Jetbrains Rider 2020.3. ASP.NET Core web application, Windows Authentication.
  • Let the new project build itself.
  • Try running the application through IIS Express.

IIS Express starts, but when I navigate to the https://localhost:XXXXX/page, I get an HTTP 500 error.

Things I've tried:

  • Delete applicationhost.config from .idea folder
  • Delete the entire .idea folder
  • Delete the contents of %home%/Documents/IISExpress/config
  • Delete the %home%/Documents/IISExpress folder and allow it to rebuild
  • Reinstall IIS Express 10
  • Reinstall the .NET Core hosting bundle

Nothing seems to change the result. The same method works for my office's IIS Express setup, but I can't go there right now. Remote access is slow enough to be inconvenient at best and impractical at worst.

Numirani

There seem to be some unresolved issues with IIS Express and Rider 2020.3, as shown in issue RIDER-55665 , although unlike the user here, I was unable to resolve the issue with the steps provided. It seems that rolling back from Rider 2020.3 to 2020.2.x fixed the issue.

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