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Article ID: 126810, created on Sep 5, 2015, last review on Sep 7, 2015

  • Applies to:
  • Plesk Automation 11.5


Control Panel is performing slowly if accessed by branding name.

The following error is in web server log /var/log/httpd/error_log:

[Mon Aug 24 10:18:09 2015] [error] server reached MaxClients setting, consider raising the MaxClients setting


Number of incoming connections exceeds the limit of web server.

The web server has the limit of maximum connections defined in /etc/httpd/conf/httpd.conf:

<IfModule prefork.c>
ServerLimit      2
MaxClients        2

The web server stops handling the incoming connections until the previously established connections are destroyed.


  1. Back up the configuration file of web server:

     # cp /etc/httpd/conf/httpd.conf{,.back}
  2. Edit the file, having increased the limits for MaxClients and ServerLimit parameters of prefork.c module:

    <IfModule prefork.c>
    ServerLimit      20
    MaxClients        20
  3. Reload the web server configuration:

    # service httpd reload

NOTE: By default the web server loads 'prefork.c' module, so the parameters of 'worker.c' are being ingnored and can be remained unchanged.

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