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 @ 00:11
Script: /report.php?postid=73429&sid=8312c2b8a4c17ac2efbb1c6eb2dcbdb1
Referer: http://stc-board.de/report.php?postid=73429&sid=8312c2b8a4c17ac2efbb1c6eb2dcbdb1