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Problem with port forwarding not working on my CAX80 connected to Xfinity.
I was having the same problem with port forwarding not working on my CAX80 connected to Xfinity. After double and triple checking for errors on my part I checked the web for a solution and found your...
after reverting to FW 2.1.5.2 port forwarding works, and Xfinity breaks it again overnight
What port are you forwarding? It is possible that Xfinity has policy to block that particular port.
Have you tried putting the receiving device in the DMZ (just as a test), to see if the packets get through?
UPnP is disabled from the start. I am forwarding port 32400 to my Plex server. Xfinity does not block the port with FW 2.1.5.2.
For troubleshooting FW 5.1.1.8 I tried forwarding several ports, including port 80. I tested the ports from https://www.yougetsignal.com/tools/open-ports/. Every port was closed.
Loading FW 2.1.5.2 with identical settings port 32400 is open and I can direct connect to my Plex server and yougetsignal shows any port I forward as open.
The only thing that is different between PF working and not working is FW 2.1.5.2 vs FW 5.1.1.8