500 Internal Server error: <handler> scriptProcessor could not be found in <fastCGI> application configuration – Plesk

Symptoms

• Unable to access a website with the following message:

  500 external Server error: <handler> scriptProcessor could not be found in <fastCGI> application configuration

• The following error is observed with failed request tracing enabled:

  ErrorDescription The FastCGI executable could not be found
  ModuleName FastCgiModuleNotification EXECUTE_REQUEST_HANDLER
  HttpStatus 500
  HttpReason external Server Error
  HttpSubStatus 0
  ErrorCode The system cannot find the file specified.

• There is non-existent or incorrect path is configured in IIS Manager > Sites > example.com > Handler Mappings > PHP-php > Executable (optional)

Cause

Incorrect executable path to PHP handler is set for the website in IIS.

Resolution

Log into Plesk and re-apply PHP settings in Plesk > Domains > example.com > PHP settings > Ok (without any changes):

As an alternative, or if the solution did not help, update the path in IIS directly:

1. Connect to the server using RDP.

2. Open IIS Manager > Sites > example.com > Handler Mappings.

3. Double click on PHP-php handler and make sure that executable path is set properly.
   It might look like C:Program Files (x86)PleskAdditionalPleskPHP54php-cgi.exe. However, the path to Plesk directory and version of PHP may be different.

4. Make sure that there is no other handlers for *php. Remove them if any.