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

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Hello everyone, please help!
My friend and I have been trying to play Heroes 3 via Hamachi all day. We have the same version - 4.0.0.0 (downloaded from the same torrent). Both firewalls and antivirus programs are disabled (including Windows Firewall - both from the Security Center and from Services). We can ping each other perfectly, and Heroes shows the Hamachi IP, but when he searches for my game, it says "IP not found," and when I search for his, it first shows "error connecting session" (or something similar), and then "Timeout." We've tried everything, and nothing works. Please let me know if you know what to do.

I had this problem with SOME players... I can play with some, but not with others.
It turned out to be a problem with my router - it has its own firewall.
The router was also distributing Wi-Fi internet.

The solution was to set my internal IP in the router's DMZ (Demilitarized Zone).

Дипломатия - искусство говорить собаке "хорошая собачка" до тех пор пока не найдешь подходящую палку.