[Windows Netgear R6400] Disabled AP mode disconnects me from internet

I live in an apartment with free internet, so I only have to plug the router into the wall to receive internet. But my NAT is strict and when I go to my router settings I can't enable UPNP or port forwarding without disabling AP mode. When I do that, I am still connected to the router but no internet for some reason. Any help?

The router I have is the Netgear R6400

Submitted November 30, 2017 at 04:42AM by ImBigRoo http://ift.tt/2i1XGIl