Trying to get two players into the same executable of Unreal 4.

I am currently working on a Multi-Player game called bovine wars. We are currently trying to get two players running around in the same scene, but from different computers. We have created the executable with the main character in it, used the console in the executable to create a listen server, connected to a colleague through Hamachi (creates a connection between the two computers) who then attempted to join my scene using the console command "Open (my ip adress), but unfortunately nothing happened. Has anyone successfully connected to each other without a lan connection in unreal 4, and if so how?

Thank You,