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: 08.05.2024 @ 16:40
Script: /memberslist.php?sid=a25a671184625977611d3e2b8a54e42f
Referer: http://stc-board.de/memberslist.php?sid=a25a671184625977611d3e2b8a54e42f