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 @ 00:09
Script: /report.php?postid=3117&sid=260f3925b6f0c4ea90f46ad8e8d40cfd
Referer: http://www.stc-board.de/report.php?postid=3117&sid=260f3925b6f0c4ea90f46ad8e8d40cfd