Advice about multiplayer online server

I have been trying to use the Unity's default server with some codes that i found and whenever i tried it, i can't try to connect the others who are away from me and i can only connect with just the ones who have the same port. But the codes i use said that it works both local and away.

 

You're going to need to elaborate a lot more, and post some code.

 

Sorry. Actually i was using a complete project from assest store called "FollowMeNET". I was trying to test if it really works. I first tried to test it by opening two windows(Making one to built a server and another one to join in) from my own laptop. It works but then when i tried with a friend who is away from me, (i can see the server that my friend built) i can't log in.

 

try using NAT