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: 29.04.2024 @ 00:00
Script: /index.php?sid=3178765eaf91e1cb9669ec3103b2e07b
Referer: http://stc-board.de/index.php?sid=3178765eaf91e1cb9669ec3103b2e07b