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: 02.05.2024 @ 16:06
Script: /report.php?postid=19819&sid=366457d7df9f1a2868d6c5d5fa9ad592
Referer: http://stc-board.de/report.php?postid=19819&sid=366457d7df9f1a2868d6c5d5fa9ad592