SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
mysql error number: 2002
mysql version: unknown
php version: 5.4.4-14+deb7u8
Date: 25.04.2014 @ 08:39
Script: /jgs_portal.php
Referer: