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 @ 18:58
Script: /memberslist.php?sid=8a652b2e5770c29e4ae2d3b0eabe9905
Referer: http://stc-board.de/memberslist.php?sid=8a652b2e5770c29e4ae2d3b0eabe9905