Could you provide more details about how your MBox is connected to your home network? Your reference to 'Ethernet/WiFi' indicates both wired (Ethernet cable) and wireless (WiFi) issues. Is it indeed a matter of trying both and neither are working out?
It would also help if to know more details about your home network -- do you have an ISP-supplied modem/router unit or do you have your own router? If you're using an Ethernet cable have you tried swapping it out with a different cable you know is good, or used a cable tester to check the cable? If WiFi, approximately how much distance is between your router and your MBox? Are you relying on a 2.4GHz or 5GHz band network, or a mix of both?
Don't rely solely on the fact that other devices are connecting to your home LAN without a problem, the issue you need to focus on is the connectivity problem between your MBox and your home LAN.