Morning all, recently changed my router to a Zyxel SBG3300 from the HH5.
Everything was fine for a few months and then all of a sudden the port forwarding seemed to stop working, I wasn't able to see open ports from the sites that can check this, my cctv system isn't abled to be remotely accessed now either.
Went back to my HH5 and I am having the seem problem.
Have tried resetting both routers to no avail, I am even seeing problems with PS4/Xbox One now aswell. Dropped connections and restricted nat types.
I am on Infinity 2.
Could BT be blocking my ports?
I read a little about the CG Nat bit last night, I also checked this and I'm not on a shared IP.
I also stopped using DNS server for my cameras when they stopped working, so at the minute I basically have a fresh hh5 with only my PS4 set with port forward, still not able to see those ports from the checker sites.
Check that DynDNS is updating your host name correctly by logging into your account and looking at the host update logs.
Also check that you have not got BT Parental controls installed, as they can interfere with DNS requests.
They will need to to fully uninstalled, not just disabled.