Article ID: 975, created on Oct 6, 2008, last review on May 10, 2014

  • Applies to:
  • Plesk for Windows


Parallels Plesk Panel stops working after the installation of Zend Optimizer.


The reason for the problem is that Zend sets a path to the php.ini file in the registry:


Therefore, all .php scripts on the server start using this setting and use the C:\WINDOWS\php.ini file for PHP configuration.


To fix this problem , the following key needs to be removed:

  • On x86 servers - HKEY_LOCAL_MACHINE\SOFTWARE\php\IniFilePath
  • On x64 servers - HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\PHP\IniFilePath

Then, all .php scripts will use the correct .ini files.

Additional Information

Please alse see article #3041.

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