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: 03.05.2024 @ 23:31
Script: /search.php?action=user&userid=177&sid=0c6459401070e6e6a389891cbc4f019a
Referer: http://stc-board.de/search.php?action=user&userid=177&sid=0c6459401070e6e6a389891cbc4f019a