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: 03.05.2024 @ 11:00
Script: /team.php?sid=e3a7ee7172fe3d029053ac6f9a4bea66
Referer: http://stc-board.de/team.php?sid=e3a7ee7172fe3d029053ac6f9a4bea66