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: 21.07.2024 @ 00:03
Script: /profile.php?userid=1&sid=d5bb9ad9dd487c3ec3cf75c8a6d5ae29
Referer: