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Upnp /strict NAT

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Upnp /strict NAT

Hello everyone, I have disabled upnp and I want a strict NAT on my xbox one. I know most people like their nat set to open. However, I prefer mine strict that way my routers firewall is not being killed by network traffic. Disabled upnp and set the firewall to high security is still causing my nat to be opened. Does anyone no how to fix this. I have also tried port forward and tried to shut down xboxes ports.. my nat is still opened up after resets on the xbox and gateway. I have a feeling someone else is bringing host somewhere in the background. How can I fix this?