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: 10.05.2024 @ 13:33
Script: /memberslist.php?letter=&sortby=msn&order=DESC&sid=c1d7ee8f9b646bfac6ca3f572e97a9c4
Referer: http://stc-board.de/memberslist.php?letter=&sortby=msn&order=DESC&sid=c1d7ee8f9b646bfac6ca3f572e97a9c4