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 @ 01:38
Script: /search.php?searchid=56524&sid=d8154dc980f3669424095ce6ad4ef00a&page=226
Referer: http://stc-board.de/search.php?searchid=56524&sid=d8154dc980f3669424095ce6ad4ef00a&page=226