Useful information: HoMM3 Software.

I reinstalled Heroes, decided to play online, the connection with the opponent is established, ping is good, the indicators in Hamachi are green, but I can't see the opponent in the game – it doesn't happen often, but I periodically receive such questions. The reason for the problem may be the absence of the Dpwsockx.dll file (a library for working with DirectX 8) in the Heroes folder. To be able to play online, the file from the archive must be in the root folder of Heroes.