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: 11.05.2024 @ 19:51
Script: /board.php?boardid=44&sid=a05a4ae006152c2c549a63c93dc7e146
Referer: http://stc-board.de/board.php?boardid=44&sid=a05a4ae006152c2c549a63c93dc7e146