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 @ 20:12
Script: /thread.php?threadid=10&threadview=0&hilight=&hilightuser=0&sid=d413283cb9db2d9f20342a36fb6367d3&page=7
Referer: http://stc-board.de/thread.php?threadid=10&threadview=0&hilight=&hilightuser=0&sid=d413283cb9db2d9f20342a36fb6367d3&page=7