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 @ 10:06
Script: /profile.php?userid=239&sid=0b0b41cac5f278a5902b265aa703c172
Referer: http://stc-board.de/profile.php?userid=239&sid=0b0b41cac5f278a5902b265aa703c172