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HTTP Error 500.35 - ANCM Multiple In-Process Applications in same Process

After switching one of our ASP.NET Core applications from out-of-process hosting to InProcess hosting, we got the following error message:

This is caused by the fact that we are running multiple applications in IIS in the same application pool. As long as we were running out-of-process this was not an issue. But when we switched to InProcess hosting it turned out that you cannot run multiple In-Process applications in the same application pool.

The solution is simple, give each application its own app pool.

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