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: 05.05.2024 @ 10:55
Script: /team.php?sid=2d4b7a44e51e99f4e49eebf2c238c74d
Referer: http://stc-board.de/team.php?sid=2d4b7a44e51e99f4e49eebf2c238c74d