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: 02.05.2024 @ 00:51
Script: /thread.php?threadid=284&threadview=0&hilight=&hilightuser=0&sid=1b3e1fa0c8115b715239e1e70ab6cdab&page=12
Referer: http://stc-board.de/thread.php?threadid=284&threadview=0&hilight=&hilightuser=0&sid=1b3e1fa0c8115b715239e1e70ab6cdab&page=12