Cox Panoramic recent update is blocking my port forwarding

Port Forwarding requires that you use the Cox Wifi app - not the modem's web browser config. Port Forwarding is for when you need an outside client to be able to connect to your PC or device (like Remote Desktop or Plex). When in the Cox Wifi app, go to Network (at the bottom) > Gateway > Advance Settings (scroll down) > Port Forwarding > Add Port Forward. You will then have to select the CONNECTED device that you need a port forwarded to under "Select One", input the port number that you are looking to forward and lastly, select the proper protocol.

If you have an internal device that is being blocked by Cox's Maximum Security Firewall software settings, such as a Nest Gen 3 Thermostat like I have, then you will have to go to your web browser, log into the modem config page and enter a Port Trigger from the Advanced > Port Triggering section. I had to create a Port Trigger for the Nest thermostat with the following values: TCP, Trigger and Target Ports: 9543-9543. Note that this does not expose port 9543 to the internet - instead it allows data that the Nest sends out (from one port) to be returned via port 9543. The game Guild Wars 2 requires TCP port 6112 to be triggered. Discord requires a very large UDP port triggering range for voice (UDP 50000-65535) though I did not need to trigger the TCP port for Discord chat. I also needed a specific TCP port triggered for a VPN connection I use otherwise, I could not connect. Lastly, you will not need to specify a specific device for a Port Trigger entry like you will for a Port Forward.