SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: php_network_getaddresses: getaddrinfo failed: Name or service not known
mysql error number: 2002
mysql version: unknown
php version: 5.6.32
Date: 12.12.2017 @ 22:47
Script: /aiboard/thread.php?postid=27936
Referer: