SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution
mysql error number: 2002
mysql version: unknown
php version: 5.6.40
Date: 30.11.2021 @ 04:27
Script: /forgotpw.php?sid=7d89a5dfa4e7f2e97d4e6e7285357fca
Referer: