How to deploy ASP.NET Core app in subfolder of website in IIS?


I want to be able to access the ASP.NET Core website with a URL such as:

The app works fine if I do not publish it in a subfolder of the IIS website. If I create a new folder (myapp) under it and publish the site there, I get this error:

HTTP Error 502.5 - Process Failure Common causes of this issue:

  • The application process failed to start
  • The application process started but then stopped
  • The application process started but failed to listen on the configured port

This is the error in the event log:

Application <app> with physical root 'C:\web\' failed to start process with commandline ' ', ErrorCode = '0x80070057 : 0.

Is it possible to run the app in a subfolder? If not, then how would I be able to run the site in a way where I can access it with the above URL?

asked on Stack Overflow May 21, 2019 by Andrew

1 Answer


Well I looked around quite a bit for an answer to the exact same question, figured it out for myself. So here it is for the next person: Click on 'Convert to Application' on the folder in IIS!! Assuming your .net core app is sitting in the 'myapp' folder.

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answered on Stack Overflow Dec 15, 2019 by Matt • edited Dec 15, 2019 by Adrian Mole

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