Article ID: 1009, created on Oct 6, 2008, last review on May 1, 2014

  • Applies to:
  • Plesk 8.x for Linux/Unix


You need to take a look at Apache log file to track down the issue

This issue might be caused by
mod_throttle Apache module and you will see the following error messages in this case.

critical_release() failed: Invalid argument
critical_acquire() failed: Invalid argument

To avoid it, you can disable mod_throttle module. Please, comment out the following line in the $PRODUCT_ROOT/apache/conf/httpd.conf file and restart Apache service.

This line should be commented out.
LoadModule mod_throttle

# /usr/local/psa/rc.d/httpd restart

b8ef5052d936e902043e41759118114e a914db3fdc7a53ddcfd1b2db8f5a1b9c 29d1e90fd304f01e6420fbe60f66f838 56797cefb1efc9130f7c48a7d1db0f0c

Email subscription for changes to this article
Save as PDF