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 @ 15:21
Script: /forgotpw.php?sid=3ee2b2fdfcb6d17b39ec23847c5ef04e
Referer: http://stc-board.de/forgotpw.php?sid=3ee2b2fdfcb6d17b39ec23847c5ef04e