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: 06.05.2024 @ 14:14
Script: /memberslist.php?sid=d3c3a3a059e5c53c3460f9a1c01842bd
Referer: http://stc-board.de/memberslist.php?sid=d3c3a3a059e5c53c3460f9a1c01842bd