How to play Heroes of Might and Magic III online via Hamachi?

We set up a network using Hamachi, version 2.0.3.89. Next to the computer name, there's a blue dot, and it says the network is connected through a relay server for both of us. However, we can't see each other in the game, SoD. What could be the problem?
P.S. We can chat with each other in the Hamachi chat.