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: 06.05.2024 @ 13:00
Script: /index.php?sid=2c0aa9615c9781d9ebcbd38159d62aa4
Referer: http://stc-board.de/index.php?sid=2c0aa9615c9781d9ebcbd38159d62aa4