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 @ 23:20
Script: /memberslist.php?sid=8ed9d19830a33e6c50c76d9d8bdc4bd2
Referer: http://stc-board.de/memberslist.php?sid=8ed9d19830a33e6c50c76d9d8bdc4bd2