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: 08.05.2024 @ 00:36
Script: /search.php?sid=42471e67c0a470b37369774f77498cd5
Referer: http://www.stc-board.de/search.php?sid=42471e67c0a470b37369774f77498cd5