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: 02.05.2024 @ 05:53
Script: /team.php?sid=90a1d91b11b4a639156ab02b29d8968d
Referer: http://stc-board.de/team.php?sid=90a1d91b11b4a639156ab02b29d8968d