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: 08.05.2024 @ 11:10
Script: /profile.php?userid=8&sid=29218f2ddcc10b7abf72c89983c9d0c1
Referer: http://stc-board.de/profile.php?userid=8&sid=29218f2ddcc10b7abf72c89983c9d0c1