Article ID: 5469, created on Jul 15, 2008, last review on Aug 12, 2014

  • Applies to:
  • Plesk 8.4 for Linux/Unix
  • Plesk 8.3 for Linux/Unix


I configured Performance options for my domain at Domains -> -> Performance, however the connection speed is still high enough and number of simultaneous connections can be exceeded.


Apache module bw_module that is responsible for assigning a maximum (or fixed) bandwidth available to a vhost is missing.


Verify that package mod_bw is installed and the module is loaded in apache configuration file.

For Linux:

LoadModule bw_module /usr/lib/httpd/modules/

For FreeBSD:

LoadModule bw_module          libexec/apache2/

Package mod_bw is included into Plesk dirtributive, it can be installed using Plesk Control Panel or command line Plesk Autoinstaller, the component is Bandwidth Limiter For Apache support (mod_bw).

Also it is located in directory /opt/bw/ of Plesk tarball that is  available at

If the package is installed but bandwidth limiter still does not function, verify that the module is enabled in apache.

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