SQL-DATABASE ERROR

Database error in (): Link-ID == false, connect failed
mysql error:
mysql error number:
mysql version: unknown
php version: 7.4.33
Date: 22.05.2024 @ 16:28
Script: /wbb2/misc.php?action=boardregeln&sid=86e154ac94f1d09e5bd84e1fbf3660de
Referer: