How to Open Port in PPTP VPN or in Ubuntu.

Hello All,

I have been struggling to get all the port open on my external IP. I tried, no-ip, port forwarding in router, third party vpn to open ports on my external IP. All failed for some reasons. So finally, I created AWS account to create my VPN server. I Launched Ubuntu Linux, configured PPTP vpn in it and now I'm able to connect to VPN(which I just created) to my laptop which is running Kali linux.

NOTE: 1. AWS instance is Ubuntu 2. My laptop is Kali .

but the problem is:

I tried to check port status in http://www.yougetsignal.com/tools/open-ports/: Firstly, I connected to ubuntu instance, then listened the port from my Ubuntu instance using "nc -lvp4444" and checked the port it showed as Open. but when I do the same in Kali linux in which the VPN is connected, it is showing as Closed.

The tutorial I used to configure PPTP in Ubuntu is An(https://gist.github.com/aioutecism/2638bb9eaf9ffc13348cy) help is much appreciated.

Sorry for bad english, please tell me if you don't understand the scenario.