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: 06.05.2024 @ 01:04
Script: /search.php?searchid=56611&sid=6a4862ba43383d56ecacbd3d4000e160&page=3
Referer: http://stc-board.de/search.php?searchid=56611&sid=6a4862ba43383d56ecacbd3d4000e160&page=3