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: 11.05.2024 @ 12:14
Script: /index.php?sid=31ecd08db52ecdf25d9dc3fcb7f88054
Referer: http://stc-board.de/index.php?sid=31ecd08db52ecdf25d9dc3fcb7f88054