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 @ 20:50
Script: /search.php?action=user&userid=74&sid=8bea9d1eedc1ea3cd6d58a8eb1cb8977
Referer: http://stc-board.de/search.php?action=user&userid=74&sid=8bea9d1eedc1ea3cd6d58a8eb1cb8977