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 @ 12:10
Script: /search.php?sid=52c0e48f7a0a80b8e3e1d1e7c28bed7a
Referer: http://stc-board.de/search.php?sid=52c0e48f7a0a80b8e3e1d1e7c28bed7a