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: 5.6.40-70+0~20240421.84+debian12~1.gbp0c0ec4
Date: 27.07.2024 @ 14:28
Script: /board.php?boardid=3&sid=f5c82f3c872c59868cbc5ff2685c3d91
Referer: