Symptoms
In some instances the following messages may occur in Dovecot:
dovecot: master: Warning: service(stats): client_limit (1000) reached, client connections are being dropped
Warning: service auth { client_limit=1000 } is lower than required under max. load (1124)
Both messages suggest that Dovecot's default_client_limit value need to be increased.
Description
The above examples suggest that the Dovecot default_client_limit is not high enough and would need to be increased. However, the Dovecot configuration file builds from a template. As this is the case, the template needs to be adjusted with the new value.
Workaround
To work around your issue, a "local" template for Dovecot needs to be copied:
cp /var/cpanel/templates/dovecot2.3/main.default /var/cpanel/templates/dovecot2.3/main.local
Once this is created, add your new default_client_limit to the file:
echo "default_client_limit = 1200" >> /var/cpanel/templates/dovecot2.3/main.local
You can adjust this limit to your needs, though the value of 1200 is used as an example.
Lastly, rebuild Dovecot's configuration file, and then restart the service:
/scripts/builddovecotconf
/scripts/restartsrv_dovecot
To verify your changes, use the following command:
doveconf -a | grep default_client_limit