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: 12.05.2024 @ 00:10
Script: /memberslist.php?sid=0b6e1769f6d8799fbdd71e44e009877c
Referer: http://stc-board.de/memberslist.php?sid=0b6e1769f6d8799fbdd71e44e009877c