If I understand correctly, you try to access the MoodleBox via Ethernet (and not via Wi-Fi).
As MoodleBox is not intended for this use case out of the box, you have to change some configurations to make it work. Have a look at this page of the documentation or instructions on how to do this.
Essentially, you have to change your DNS in your router (PiNet server?) so that it assign the domain name moodlebox.home to the numeric IP address of your MoodleBox.