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: 09.05.2024 @ 01:52
Script: /search.php?searchid=56698&sid=4f9bd842cbc5791d5a42c4f0a7f7f06b&page=7
Referer: http://stc-board.de/search.php?searchid=56698&sid=4f9bd842cbc5791d5a42c4f0a7f7f06b&page=7