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 @ 17:07
Script: /index.php?sid=2395532031d2d1e37a9047b1da13c73b
Referer: http://stc-board.de/index.php?sid=2395532031d2d1e37a9047b1da13c73b