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: 09.05.2024 @ 20:02
Script: /profile.php?userid=181&sid=bdea9be8ff91ef589341bb38455afc3c
Referer: http://stc-board.de/profile.php?userid=181&sid=bdea9be8ff91ef589341bb38455afc3c