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: 28.04.2024 @ 15:07
Script: /search.php?action=user&userid=3&sid=db2ccd4953f76263279b82d7340a2719
Referer: http://stc-board.de/search.php?action=user&userid=3&sid=db2ccd4953f76263279b82d7340a2719