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: 06.05.2024 @ 15:42
Script: /misc.php?action=imprint&sid=d53d1d957a4ed862f5a7ffb27f83fc5c
Referer: http://stc-board.de/misc.php?action=imprint&sid=d53d1d957a4ed862f5a7ffb27f83fc5c