Parallels Plesk Panel shows 503 error: 64-bit ISAPI extension is configured on Plesk application pool

Refers to:

  • Plesk 11.0 for Windows
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Windows
  • Plesk 12.0 for Windows

Created:

2016-11-16 12:41:46 UTC

Modified:

2017-02-03 19:35:55 UTC

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Parallels Plesk Panel shows 503 error: 64-bit ISAPI extension is configured on Plesk application pool

Symptoms

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

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

Parallels Plesk Panel 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
  1. Restart Control Panel service using Parallels Plesk Panel Services Monitor .
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