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: 29.04.2024 @ 17:50
Script: /search.php?sid=bc8d81c47e19e6e7b9dd31871c53c9d2
Referer: http://stc-board.de/search.php?sid=bc8d81c47e19e6e7b9dd31871c53c9d2