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: 05.05.2024 @ 15:39
Script: /profile.php?userid=20&sid=b0b9f693a963521bb5da9d35cfd7ca58
Referer: http://stc-board.de/profile.php?userid=20&sid=b0b9f693a963521bb5da9d35cfd7ca58