Got this issue, included MTU issue. My WiFi provider said everything on there end is good. This has only started 2 days ago : r/XboxSupport
Xbox 360 - NAT Type is Set to Strict (or Moderate)
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Xbox Networking button is missing in Windows 10 Settings : r/WindowsHelp
Xbox 360 - NAT Type is Set to Strict (or Moderate)
How to change NAT type on Xbox One | PureVPN
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Someone told me to change my NAT Type, Network Settings, or Ports for my Xbox 360. Can you help? – The Behemoth - Support
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Troubleshoot Xbox 360 NAT errors | Xbox Support
Open NAT type goes back to Moderate every time the computer restarts - - Microsoft Community
Can't fix double NAT : r/XboxSupport
