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: 30.04.2024 @ 23:43
Script: /usercp.php?action=buddy_list&sid=976bae6637d6069f1fa4968148eeeb37
Referer: http://stc-board.de/usercp.php?action=buddy_list&sid=976bae6637d6069f1fa4968148eeeb37