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: 04.05.2024 @ 16:11
Script: /search.php?sid=3740c0f38d66fb0cc5c72761b23d8e2e
Referer: http://stc-board.de/search.php?sid=3740c0f38d66fb0cc5c72761b23d8e2e