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 @ 16:59
Script: /report.php?postid=21721&sid=79619d74c010b21bbd9f851d831c5c5a
Referer: http://stc-board.de/report.php?postid=21721&sid=79619d74c010b21bbd9f851d831c5c5a