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 @ 23:07
Script: /markread.php?boardid=29&sid=31324030d020b9880cac5a4659e2e6f8
Referer: http://stc-board.de/markread.php?boardid=29&sid=31324030d020b9880cac5a4659e2e6f8