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: 05.05.2024 @ 00:57
Script: /misc.php?action=imprint&sid=f1c6a42fe34a102e5e22c175dd9469da
Referer: http://stc-board.de/misc.php?action=imprint&sid=f1c6a42fe34a102e5e22c175dd9469da