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: 04.05.2024 @ 09:57
Script: /team.php?sid=deff7ff8f65f3ab74ad57cc7ad1f9887
Referer: http://stc-board.de/team.php?sid=deff7ff8f65f3ab74ad57cc7ad1f9887