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 @ 12:42
Script: /profile.php?userid=271&sid=d7ad1dd4e64256864dc8b33ab0ed0ec6
Referer: http://stc-board.de/profile.php?userid=271&sid=d7ad1dd4e64256864dc8b33ab0ed0ec6