Parallels Virtualization and Automation Software

SYMPTOMS

On Domains -> domain.tld -> Performance screen both parameters are set to unlimited and can not be modified:

Bandwidth limiting

Maximum network use (KB/s) Unlimited

Connections limiting

Connections limited to Unlimited

CAUSE

Most probably appropriate mod_bw component is not installed on the server.

RESOLUTION

Install mod_bw component through Plesk admin CP -> Server -> Updater.
Just select appropriate Plesk version, check Bandwidth Limiter For Apache support (mod_bw) and click Install.

If package is installed, it is necessary to make sure that module mod_bw.so is really loaded into Apache configuration:

# grep mod_bw -r HTTPD_CONF_D
# grep mod_bw -r HTTPD_INCLUDE_D

Module should not be commented like in the example, below:

# grep mod_bw -r HTTPD_INCLUDE_D
/etc/httpd/conf.d/bw.conf:LoadModule bw_module /usr/lib/httpd/modules/mod_bw.so

Additional information

HTTPD_CONF_D and HTTPD_INCLUDE_D are directories from Plesk configuration file, as in example below:

# grep HTTPD /etc/psa/psa.conf
HTTPD_VHOSTS_D /var/www/vhosts
HTTPD_CONF_D /etc/httpd/conf
HTTPD_INCLUDE_D /etc/httpd/conf.d
HTTPD_BIN_D /usr/bin
HTTPD_LOG_D /var/log/httpd