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: 05.05.2024 @ 00:51
Script: /report.php?postid=86992&sid=d3a7f0c99f91609b88a3ffbbc50aea57
Referer: http://stc-board.de/report.php?postid=86992&sid=d3a7f0c99f91609b88a3ffbbc50aea57