Problem with SET on Kali 2016

I was trying out the credentials harvester method with site clone on SET on Kali 2016.

It's working when I gave my pc ip ,but only in the same network.

Next, I tried with public ip and port forwarded port 80 to my pc ip.

I am using a router with a broadband which is providing me static ip (but public ip changes with each logout & login).

It now doesn't work on this network also (and not elsewhere also).

then i port forwarded ports to 1000 but again it failed.I checked here and found port 80 is open.

Please help what to do?

I am using Kali as host on amd-64 pc with 4GB DDR3 RAM.(If it helps)