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: 29.04.2024 @ 14:17
Script: /memberslist.php?letter=&sid=58821344b728a8da96f490618b2f212f&sortby=homepage&order=DESC
Referer: http://stc-board.de/memberslist.php?letter=&sid=58821344b728a8da96f490618b2f212f&sortby=homepage&order=DESC