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 @ 08:21
Script: /search.php?action=user&userid=136&sid=17bc00f0a38f96df00eb4af9dd30fbcd
Referer: http://stc-board.de/search.php?action=user&userid=136&sid=17bc00f0a38f96df00eb4af9dd30fbcd