SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Unknown MySQL server host 'db695.1und1.de' (1)
mysql error number: 2005
mysql version: unknown
php version: 5.2.17
Date: 27.04.2015 @ 02:14
Script: /rcn/thread.php?postid=16092
Referer: