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[FIX] ‘Service Unavailable’ error message on a server with Plesk x64

Article ID: 1125 
Last Review: Aug,22 2007
APPLIES TO:
  • Plesk for Windows

RESOLUTION

The source of this problem is in 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.

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

Keywords: Could not load ISAPI 64-bit 32-bit mode IIS

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