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 @ 23:30
Script: /search.php?action=user&userid=106&sid=0342d95c0d9cc4be9951c57f060237ec
Referer: http://stc-board.de/search.php?action=user&userid=106&sid=0342d95c0d9cc4be9951c57f060237ec