Internal Server Error: Calling LoadLibraryEx on ISAPI filter

Created:

2016-12-18 06:50:38 UTC

Modified:

2017-08-08 13:10:08 UTC

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Internal Server Error: Calling LoadLibraryEx on ISAPI filter

Applicable to:

  • Plesk 12.5 for Windows

Symptoms

  1. Plesk upgrade was performed.

  2. Websites shows one of the following errors:

    PLESK_INFO: HTTP Error 500.0 - Internal Server Error
    Calling LoadLibraryEx on ISAPI filter "С:\\Parallels\\Plesk\\Additional\\PleskPHP5\\php5isapi.dll" failed

    PLESK_INFO: HTTP Error 500.0 - Internal Server Error
    Calling LoadLibraryEx on ISAPI filter "C:\\Program Files (x86)\\Parallels\\Plesk\\isapi\\urlprotect.dll" failed

  3. In Plesk Tools & Settings > PHP Settings handlers are shown as broken (red icon).

Cause

Upgrade was not fully completed.

Resolution

Install the broken PHP handlers via Plesk installer Plesk > Tools & Settings > Updates & Upgrades or manually.

Additional information can be found in How to fix problem with ISAPI filters

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