SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Can't connect to MySQL server on 'nettle.store.d0m.de' (146)
mysql error number: 2003
mysql version: unknown
php version: 5.3.29
Date: 29.03.2017 @ 07:18
Script: /jgs_portal.php?sid=ac127ba3c8e460512b19e35715c37da8
Referer: