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: 09.05.2024 @ 22:03
Script: /memberslist.php?sid=43796816bb7478c3f00b16727d8859d0
Referer: http://www.stc-board.de/memberslist.php?sid=43796816bb7478c3f00b16727d8859d0