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

I hope this thread hasn't been closed yet. My friends and I have been racking our brains. We can't find an answer anywhere. We have two local networks in different parts of the city. Each has a four-port router. So, we set up Hamachi. I host, and everyone else connects to me. The ping is good, everything is green, and there are no problems. Firewalls are disabled, and no one has installed any firewall software on their computers. Antivirus software is also disabled. I create a game. The others enter my IP address and try to connect. The game is found, but when they connect, there's a suspicious pause, after which the players are not allowed to join. We tried hosting in another local network, and the same problem occurs. Where did we make a mistake?