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: 09.05.2024 @ 06:53
Script: /search.php?action=user&userid=1&sid=c94eea2fe1a990c67118f71b9e866c15
Referer: http://stc-board.de/search.php?action=user&userid=1&sid=c94eea2fe1a990c67118f71b9e866c15