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: 07.05.2024 @ 09:08
Script: /profile.php?userid=239&sid=d4c3c0b99e165de087bd0af9f5e03442
Referer: http://www.stc-board.de/profile.php?userid=239&sid=d4c3c0b99e165de087bd0af9f5e03442