ecicerone what do you mean with "MoodleBox is working fine via ethernet."
You can't use a MoodleBox via Ethernet when you take it out of the box. The MoodleBox does not provide DHCP and DNS services to the ethernet port. The only thing you should get on the Ethernet port is a SSH connection.
Please write which Raspberry Pi you are using and how you did the installation.
Best regards, Ralf