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: 03.05.2024 @ 01:32
Script: /misc.php?action=faq&sid=690f94ee0a3b7bd5ab101ab4d27ed341
Referer: http://stc-board.de/misc.php?action=faq&sid=690f94ee0a3b7bd5ab101ab4d27ed341