HTTP error 503 - Application Request Routing\requestRouter.dll failed to load

Created:

2017-03-08 15:07:54 UTC

Modified:

2017-08-08 13:45:54 UTC

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HTTP error 503 - Application Request Routing\requestRouter.dll failed to load

Symptoms

  • Websites are not accessible with HTTP error 503

  • PleskControlPanel and most IIS application pools could not be started.

  • Windows Application event log contains the following error under Event ID 2280

    The Module DLL C:\Program Files (x86)\IIS\Application Request Routing\requestRouter.dll failed to load. The data is the error.
    

Cause

Microsoft Application Request Routing package corrupted or missing.

Resolution

Download and install Application Request Routing package from Microsoft website:

Microsoft Application Request Routing 3.0 (x64)

Microsoft Application Request Routing 3.0 (x86)

 

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