SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Connection refused
mysql error number: 2002
mysql version: unknown
php version: 5.6.40-57+0~20211119.60+debian9~1.gbp8a9bd1
Date: 11.05.2024 @ 20:21
Script: /memberslist.php?letter=&sortby=userposts&order=ASC&sid=c10bd236c977223b2cd2d09ff77f6994
Referer: http://stc-board.de/memberslist.php?letter=&sortby=userposts&order=ASC&sid=c10bd236c977223b2cd2d09ff77f6994