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 @ 23:16
Script: /report.php?postid=86903&sid=93d31be41a4f521a10c9294d9f1dbc0c
Referer: http://stc-board.de/report.php?postid=86903&sid=93d31be41a4f521a10c9294d9f1dbc0c