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: 10.05.2024 @ 01:00
Script: /calendar.php?sid=8f542132f09b329f7e01040da1212c87
Referer: http://stc-board.de/calendar.php?sid=8f542132f09b329f7e01040da1212c87