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: 11.05.2024 @ 17:10
Script: /profile.php?userid=250&sid=e05f9ee3c56189f79d4197f6959fb7c9
Referer: http://stc-board.de/profile.php?userid=250&sid=e05f9ee3c56189f79d4197f6959fb7c9