Websites are unavailable after upgrade to Plesk 10.4 and above

Created:

2016-12-12 03:40:51 UTC

Modified:

2017-08-08 13:31:03 UTC

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Websites are unavailable after upgrade to Plesk 10.4 and above

Applicable to:

  • Plesk Onyx for Windows

Symptoms

  1. Websites are unavailable after upgrade to Plesk 10.4 and above:

    Service Unavailable
  2. Websites application pools go down with the following messages in EvenViewer:

    Could not load all ISAPI filters for site / service. To cancel the start of the service.

    HTTP Filter DLL C: Failed to read the \\Program Files (x86)\\Parallels\\Plesk\\isapi\\sitepreview.dll. The data is the error.
  3. There is no sitepreview.dll file in %plesk_dir%\\isapi directory

Cause

Explicit ISAPI filter in IIS. Starting from Plesk 10.2 sitepreview ISAPI filter is not required anymore.

Resolution

  1. Remove ISAPI filter for sitepreview with the command below:

    "%plesk_dir%\\admin\\bin\\websrvmng.exe" --remove-global-filter --name=sitepreview
  2. Since global filters are cached in IIS it is recommended to restart IIS:

    iisreset /RESTART /TIMEOUT:120
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