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The Module DLL C:\WINDOWS\system32\inetsrv\aspnetcore.dll failed to load. The data is the error.

After upgrading to the Anniversary Update of Windows 10, all applications on my local IIS no longer work and return a 503 error instead. When looking inside IIS I noticed that my Application pools were stopped but after restarting them, they stopped when the first new request arrives.

Inside the Windows Event Viewer I noticed the following error message:

The Module DLL C:\WINDOWS\system32\inetsrv\aspnetcore.dll failed to load.  The data is the error.

To fix it, I had to repair the installation of Microsoft .NET Core 1.0.1 – VS 2015 Tooling Preview 2:

  • Go to “Programs and Features”
  • Search for .NET Core

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  • Select Microsoft .NET Core 1.0.1 – VS 2015 Tooling Preview 2 from the list
  • Click on Change and choose Repair

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