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: 29.04.2024 @ 19:36
Script: /attachment.php?attachmentid=696&sid=e5bda64b9d9e0d4ef226c8468888908f
Referer: http://stc-board.de/attachment.php?attachmentid=696&sid=e5bda64b9d9e0d4ef226c8468888908f