How to Fix Xbox Double NAT Detected Issue
Follow the steps below to help you fix the Double NAT problem and change NAT Type from ‘Moderate‘ or ‘Strict‘ to ‘Open‘ in Xbox.
Login to your Xbox One S/X console and follow these steps.
Step 1
Under Network Settings, go to Advanced Settings and select Alternate port selection.
Step 2
Select Manual option and then choose a Service port number. Choose one at the top of the list.
Step 3
Go back to Network Settings and wait for NAT Type to refresh. If you see Double NAT, go to Advanced Settings
> Alternate port selection again. Tap Manual and this time select a different port.
Step 4
Go back to Network Settings and wait for NAT Type to refresh. This will fix the NAT type from Moderate
Double NAT detected to Open. If unsuccessful, repeat the step again and choose the next Service port until you find the one that enables Open NAT type in your Xbox One console.