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: 06.05.2024 @ 23:36
Script: /profile.php?userid=244&sid=f8bd1ad63ee8549b6d404350e734ef8a
Referer: http://stc-board.de/profile.php?userid=244&sid=f8bd1ad63ee8549b6d404350e734ef8a