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: 10.05.2024 @ 01:16
Script: /search.php?sid=376e4c59d7bcd5e8c4cf5a55e2913c0d
Referer: http://stc-board.de/search.php?sid=376e4c59d7bcd5e8c4cf5a55e2913c0d