Article ID: 120805, created on Mar 30, 2014, last review on Jun 17, 2016

  • Applies to:
  • Plesk 12.0 for Windows
  • Plesk 11.5 for Windows


Websites are not available after Plesk upgrade on the Windows server.

Windows Event Viewer -> Application has errors with EventID 2280

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

Or the following error appears:

Could not load type '%SystemRoot%\system32\inetsrv\rewrite.dll'.


%SytemRoot%\system32\inetsrv\rewrite.dll does not exists on the filesystem or corrupted. It would also help to check the Event Viewer Logs (Windows Logs -> Application) to look for specific causes of failure before proceeding to troubleshoot any further.


  • Please check if rewrite.dll exists in the folder %SystemRoot%\System32\inetsrv. If the dll doesn't exist, you need to download a correct URL Rewrite Module version and install it .

Download IIS Rewrite Module (x86)
Download IIS Rewrite Module (x64)

Or you can try to repair the IIS Rewrite Module installation (run the downloaded .msi package and click Repair):

If step above was not helped, rename or remove %SystemRoot%\System32\inetsrv\rewrite.dll file and reinstall the package

After solution will be applied retry to upgrade Plesk again.

Search Words


HTTP Error 503. The service is unavailable.

C:\Windows\system32\inetsrv\rewrite.dll failed to load

a914db3fdc7a53ddcfd1b2db8f5a1b9c 56797cefb1efc9130f7c48a7d1db0f0c 46a8e394d6fa13134808921036a34da8 85a92ca67f2200d36506862eaa6ed6b8 bd7fc88cf1b01f097749ae6f87272128 ed7be2b984f9c27de1d2dc349dc19c6d a766cea0c28e23e978fa78ef81918ab8

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