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 @ 19:24
Script: /search.php?searchid=56663&sid=d7de831ba9a9b8d3a64a64bb83517dd4&page=534
Referer: http://stc-board.de/search.php?searchid=56663&sid=d7de831ba9a9b8d3a64a64bb83517dd4&page=534