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: 10.05.2024 @ 01:00
Script: /forgotpw.php?sid=c99482d7cc2bf6ceba7e27e0e215f9e5
Referer: http://stc-board.de/forgotpw.php?sid=c99482d7cc2bf6ceba7e27e0e215f9e5