Network Address Translation Problem
I had changed my NAT type from Symmetric Cone (strict) to Full Cone (open) a while ago by enabling UPnP feature on my ‘router’ (ZTE F609) once for gaming purposes.
Today, I wanted to develop an application that uses Google’s API, and therefore, I need to register the IP address and port of the server where my application is running. So I set up port forwarding using the MAC address of my computer on my router to make my application accessible using my public IP. But then, my computer cannot be accessed from the public IP, and my NAT type changed to Symmetric Cone (strict). Using DMZ instead of port forwarding was returned the same result.
I can see all used port entry (tested with games) popping up on the UPnP mapping list, but the feature was not working correctly (NAT status still in strict).
How could I set up the port forwarding without bothering the UPnP?
I disabled both DMZ and port forwarding, but the NAT status is still in strict.
and still, I cannot access my computer using the public address.
How could I fix this issue?