This Xbox help article explains how having a "Moderate" or "Strict" NAT can affect you and how it can be solved: https://support.xbox.com/en-GB/help/hardware-n

This Xbox help article explains how having a "Moderate" or "Strict" NAT can affect you and how it can be solved: https://support.xbox.com/en-GB/help/hardware-network/connect-network/xbox-one-nat-error https://support.xbox.com/en-GB/help/hardware-network/connect... I don't think anything has fundamentally changed in this area since the days of the Xbox 360. Back then it was a PITA to get two or more consoles working properly without UPnP, and I can't see anything about the problem that would be different now. Nintendo has a similar page: https://www.nintendo.co.uk/Support/Nintendo-Switch/Troubleshooting-Issues-Related-to-NAT-1511425.html https://www.nintendo.co.uk/Support/Nintendo-Switch/Troublesh... So does Sony: https://manuals.playstation.net/document/gb/ps4/settings/nw_test.html#ID39017 https://manuals.playstation.net/document/gb/ps4/settings/nw_...