I've tried setting a port open for a game a few times for my computer and port checker says its closed/ unreachable everytime. I've even tried DMZ mode which showed open for about 5 seconds then showed closed again. I even tried setting a different pc to DMZ to see if something on my desktop was blocking it. Same issue showed that port was closed. Port is 25565 which is used for minecraft so I can't imagine that poses a security risk and would be blocked by something on the backend.
Try disabling the Xfi Advanced Security feature as a workaround for now and see. It's buggy ! And there is currently no way for an end-user to be able to whitelist anything;
Thanks for your reply. I tried this being hopeful, but no luck. My device wasn't showing up under devices, but after disabling IPv6 I got it to show up. When I try to port forward that device it shows its forwarding it to a different ip address than that assigned to my computer that shows up under ipconfig. DMZ still does nothing as well.