Article ID: 123175, created on Oct 17, 2014, last review on Oct 1, 2015

  • Applies to:
  • Plesk 12.0 for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows


The domain loads with the error:

    Calling LoadLibraryEx on ISAPI filter "C:\Program Files (x86)\Parallels\Plesk\isapi\urlprotect.dll" failed


Domain's application pool does not support 32 applications.


  1. Open IIS->domains, find your domain name and name of application pool that domain uses.
  2. Make sure that "Enable 32-Bit Applications" is enabled in IIS->Application pool->domain's application pool->Advanced settings.

Search Words

Plesk is not opening

urlprotect.dll failed

Calling LoadLibraryEx on ISAPI filter "C:\Program Files (x86)\Parallels\Plesk\isapi\urlprotect.dll" failed

Domain gives error even with html

500 internal server error

website not working after restore

The HTTP Filter DLL C:\Program Files (x86)\Parallels\Plesk\isapi\urlprotect.dll failed to load. The data is the error.

website don't show

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