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 @ 15:46
Script: /search.php?sid=81b91bcc1f309b1277ff4b37577e9440
Referer: http://stc-board.de/search.php?sid=81b91bcc1f309b1277ff4b37577e9440