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 @ 23:02
Script: /misc.php?action=imprint&sid=c6527ec9a8fa4f5a63f52dec4437f87a
Referer: http://stc-board.de/misc.php?action=imprint&sid=c6527ec9a8fa4f5a63f52dec4437f87a