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: 29.04.2024 @ 00:53
Script: /memberslist.php?sid=a2dca35af83fc2502233a4f65e87a88a
Referer: http://stc-board.de/memberslist.php?sid=a2dca35af83fc2502233a4f65e87a88a