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: 01.05.2024 @ 17:31
Script: /misc.php?action=imprint&sid=99218d9db1ac7c0ed89aae8629675d1a
Referer: http://stc-board.de/misc.php?action=imprint&sid=99218d9db1ac7c0ed89aae8629675d1a