Plesk shows HTTP Error 503. The service is unavailable: 64-bit ISAPI extension is configured on Plesk application pool

Created:

2016-11-16 12:41:46 UTC

Modified:

2017-08-16 16:40:38 UTC

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Plesk shows HTTP Error 503. The service is unavailable: 64-bit ISAPI extension is configured on Plesk application pool

Applicable to:

  • Plesk 11.x for Windows
  • Plesk 11.x for Linux
  • Plesk 12.0 for Windows

Symptoms

Error "HTTP Error 503. The service is unavailable" appears while opening Plesk.

The following error is in Windows Event Viewer > System log:

Application pool 'DefaultAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

And the following error is in Windows Event Viewer > Application log:

The Module DLL 'C:\\Program Files\\Common Files\\Microsoft Shared\\Web Server Extensions\\15\\isapi\\spnativerequestmodule.dll' could not be loaded due to a configuration problem. The current configuration only supports loading images built for a x86 processor architecture. The data field contains the error number. To learn more about this issue, including how to troubleshooting this kind of processor architecture mismatch error, see http://go.microsoft.com/fwlink/?LinkId=29349.

Cause

Plesk application pool is working in 32-bit mode. Global (i.e. applied to all application sites on all application pools) ISAPI module spnativerequestmodule.dll (SharePoint 2013) is a 64-bit application. Attempt to load 64-bit application on 32-bit application pool is not possible, which causes application pool to fail on start-up.

Resolution

IIS 7.x can load global ISAPI modules conditionally, depending on application pool's settings:

  1. Open Command Prompt ( Start > Run > cmd.exe ).

  2. Type these commands:

    cd %systemroot%\\system32\\inetsrvappcmd.exe set config -section:system.webServer /globalModules /[name='SPNativeRequestModule'].preCondition:integratedMode,bitness64
  3. Restart Plesk Management service using Plesk Services Monitor .
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