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: 04.05.2024 @ 13:54
Script: /thread.php?threadid=802&threadview=0&hilight=&hilightuser=0&sid=b500379a2242cf62ee477b9362cb2777&page=1
Referer: http://www.stc-board.de/thread.php?threadid=802&threadview=0&hilight=&hilightuser=0&sid=b500379a2242cf62ee477b9362cb2777&page=1