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: 07.05.2024 @ 08:28
Script: /memberslist.php?sid=41a7bc671bb123cf1299a8f49442d67f
Referer: http://stc-board.de/memberslist.php?sid=41a7bc671bb123cf1299a8f49442d67f