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: 08.05.2024 @ 17:59
Script: /misc.php?action=faq3&sid=7d4b192d30b1f7d849fc4e6b2d28abfb
Referer: http://stc-board.de/misc.php?action=faq3&sid=7d4b192d30b1f7d849fc4e6b2d28abfb