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: 08.05.2024 @ 13:38
Script: /forgotpw.php?sid=87538d3be4fb1d0aac9d0b9de9be0b6b
Referer: http://stc-board.de/forgotpw.php?sid=87538d3be4fb1d0aac9d0b9de9be0b6b