[FIX] "Service Unavailable" error message on a server with PP x64

Created:

2016-11-16 13:22:33 UTC

Modified:

2017-08-16 17:24:01 UTC

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[FIX] "Service Unavailable" error message on a server with PP x64

Applicable to:

  • Plesk 11.x for Windows
  • Plesk 9.x for Windows

Symptoms

Plesk Panel showing "Service Unavailable" error.

Cause

The source of this problem is IIS, which works in 64-bit mode by default. The problems related to IIS functionality in 64-bit mode are described in the following article:

http://support.microsoft.com/?id=895976

IIS 6.0 supports both the 32-bit mode and the 64-bit mode. However, IIS 6.0 does not support running both modes at the same time on a 64-bit version of Windows.

Resolution

  1. To switch IIS to 32-bit mode, the following command should be used:
    cscript %SYSTEMDRIVE%\\inetpub\\adminscripts\\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1

2.To switch IIS back to 64-bit mode, the following command should be used:

    cscript %SYSTEMDRIVE%\\inetpub\\adminscripts\\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 0
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