Me and my flatmate are trying to play together but we kept getting NAT Moderate errors when trying to join fire teams, we followed the advice of UPnP being turned on (which it already was) and then tried manually forwarding the ports etc. It didnt work. We have no idea why. I just get a generic network error, they still get the NAT Moderate error.
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Not sure if you can have 2 consoles using the same ports at the same time on the same address. You may need a separate cable connection for each.