Plesk displays 503 Service Unavailable error, in Event Viewer: iisnode.dll failed to load

Refers to:

  • Plesk Onyx for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 12.5 for Windows

Created:

2016-11-16 13:05:58 UTC

Modified:

2016-12-21 19:57:07 UTC

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Plesk displays 503 Service Unavailable error, in Event Viewer: iisnode.dll failed to load

Symptoms

When loading Plesk the following error is displayed:

HTTP Error 503. The service is unavailable

In Event Viewer > Windows Logs > Application the following error:

The Module DLL C:\\Program Files (x86)\\iisnode\\iisnode.dll failed to load. The data is the error.

Cause

Plesk users psaadm and psacln do not have access to C:\\Program Files (x86)\\iisnode\\ directory by default.

Resolution

Perform the following steps to fix the issue:

  1. Add the following lines into the disksecurity.xml file which is stored in %plesk_dir%\\etc\\DiskSecurity\\ directory:

    <!-- Program Files\\iisnode -->
    <Entry AccounType="1" Account="Psaadm" Path="{ProgramFiles}" SubPath="iisnode" AceFlags="ThisFolderSubfoldersAndFiles" AccessMask="Read" EntryFlags="0x40" />
    <Entry AccounType="1" Account="Psacln" Path="{ProgramFiles}" SubPath="iisnode" AceFlags="ThisFolderSubfoldersAndFiles" AccessMask="Read" EntryFlags="0x40" />
  2. Run Plesk Reconfigurator to correct disk permissions or correct them manually:

    Go to `C:\\Program Files (x86)\\` and right-click on `iisnode`.
    In opened window click on **Security > psacln**.
    Assign read and access permissions for `psacln`.
    In IIS start stopped application pools.
  3. Restart Plesk Management Service service.

If it does not solve the issue:

  1. Back up IIS configuration file.

    copy "%windir%\\System32\\inetsrv\\config\\applicationHost.config" "%windir%\\System32\\inetsrv\\config\\applicationHost.config.bak"
  2. Remove iisnode module under IIS > Sites > PleskControlPanel > Module .

Additional information

#2139415251 - Websites show 503 Service Unavailable error. In Event Viewer: iisnode.dll failed to load.

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