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: 28.04.2024 @ 15:29
Script: /memberslist.php?letter=&sid=bb225b805df965078c1e009a273a294d&order=ASC&sortby=u.avatarid&page=9
Referer: http://stc-board.de/memberslist.php?letter=&sid=bb225b805df965078c1e009a273a294d&order=ASC&sortby=u.avatarid&page=9