Hi ! I had some time to investigate problem with e-mail broken user authentication (described in my previous thread). Server had to be restarted ASAP and I assumed that this is due to possible MariaDB crash. Now this problem happened again, and its seems everything is fine with MariaDB - connection to ISPConfig server, Joomla site went OK, while Postfix and Dovecot throws these errors. Jan 23 01:56:09 mail dovecot: auth-worker(30866): Warning: mysql: Query failed, retrying: MySQL server has gone away (idled for 60 secs) Jan 23 01:56:09 mail dovecot: auth-worker(30866): Error: sql(xxx,192.168.0.79,<mxmpuBSABs3AqABP>): Password query failed: MySQL server has gone away (idled for 54 secs) Jan 23 01:56:12 mail postfix/smtpd[23459]: warning: mysql:/etc/postfix/mysql-virtual_client.cf: table lookup problem Jan 23 01:56:31 mail postfix/smtpd[23459]: warning: mysql:/etc/postfix/mysql-virtual_client.cf: table lookup problem Jan 23 01:57:06 mail postfix/proxymap[18743]: warning: mysql query failed: MySQL server has gone away Problematic server is down, 1 month old VM copy is running in place. Anyway, I'm not sure if this won't happen again. Anyone have any idea what went wrong, and how to fix this issue ? Thanks in advance.
Did you try raising the max_connections and max_user_connections values in mysql/mariaDB config? Try to use a high value eg. 500 or 1000 for both.
MariaDB configs left as is after Perfect guide setup. cd /etc/mysql/mariadb.conf.d cat 50-server.cnf | grep max --> #max_connections = 100 This only one connection option left commented out in config, so I assume this is default value. "max_user_connections" is nowhere to be found in configs, is it obsolete or still being used ?
It is still being used, add both settings and set them to a higher value like 500 or 1000. Postfix tends to open a lot of connections and you can reach the 100 connection limit easily on a busy mail server.
It must be set in the [mysqld] section. Search which file contains [mysqld] section and then add both lines there.
