Your network is behind a UPnD port-restricted NAT

well that's what I'm getting on my Xbox one s as if right now. I had a problem when I first got my Xbox and my internet. Then it said you are behind a port-restricted Nat only. I port forwarded all the necessary ports then restarted my gateway. It worked.
I had an open NAT for a couple weeks.. now I'm getting this out of no where and getting no where with it. All help would be very appreciated. Thanks.

:)

 

Your network is behind port restricted NAT

They have slower internet and you are wondering why your connection is slower?

Depends on the router on how to disable NAT or make NAT less intense. We will need your service provider (at the place that has restrictive NAT) and the router they have.

Those will help us reconfigure a router / modem with different nat settings.

 

Your network is behind port restricted NAT

Opening my NAT type through my modem and port forwarding my Xbox, as well as some extra tweaking the official Xbox website recommended, fixed all my connection issues.

For accessing my devices, I type in 192.168.1.1 into the address bar, enter my username and password which is usually "admin" and "password" for most people, go to advanced settings, go to WAN setup, change NAT filtering to open and disable SIP ALG. It may be a bit different for you depending on what modem you're using. After doing this, check out the links I posted. Good luck.

https://www.bungie.net/en/Help/Article/11931

Xbox One Connection Error Help | Xbox One Network Error Messages | Xbox Live Connection Problems

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Have you set up a static IP to your console's MAC address, and associated those ports with that IP?

Disable UPnP in the gateway. It's not always reliable.