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: 28.04.2024 @ 19:02
Script: /thread.php?threadid=827&page=7&sid=99b394717a594e87e9f984c2d851ae0c
Referer: http://stc-board.de/thread.php?threadid=827&page=7&sid=99b394717a594e87e9f984c2d851ae0c