مشكله The database has encountered a problem.

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Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
/home/vol4/ql4h.net/ql4h_4844884/al3nood.co.tv/htdocs/vb/includes/class_core.php on line 311

MySQL Error   : 
Error Number  : 
Request Date  : Wednesday, January 27th 2010 @ 12:06:36 AM
Error Date    : Wednesday, January 27th 2010 @ 12:06:36 AM
Script        : http://www.al3nood.co.tv/vb/index.php
Referrer      : 
IP Address    : 78.93.101.55
Username      : 
Classname     : vB_Database
MySQL Version : 
-->