I'm not really sure if this will be helpful to anybody, but I figured I'd post it anyway just in case. My friend and I have been struggling recently to make MNAI work in multiplayer and the eventual solution we discovered wasn't all contained in one place anywhere, hence this post.
If you are using the steam version of Civilization IV, right click on Beyond the Sword in your games list, go on properties and then the betas tab. Select original_release_unsupported and close the window. Steam will download the old version.
We had no luck connecting using the internet lobby (hence the above alteration) or the LAN lobby through Hamachi. However, we found that if I hosted the game on LAN and my friend used my Hamachi IP to connect, it worked.
Note: both of our Hamachis gave some errors on the various diagnostic screens it provides but it seemed to work anyway. This threw us off for a long time because I thought it was Hamachi not working properly because I'm on Windows 10, but this wasn't the case.
Anyway, I don't know if this stuff is obvious already for people still playing Civ IV multiplayer but it might help any new people (if any exist!).
If you are using the steam version of Civilization IV, right click on Beyond the Sword in your games list, go on properties and then the betas tab. Select original_release_unsupported and close the window. Steam will download the old version.
We had no luck connecting using the internet lobby (hence the above alteration) or the LAN lobby through Hamachi. However, we found that if I hosted the game on LAN and my friend used my Hamachi IP to connect, it worked.
Note: both of our Hamachis gave some errors on the various diagnostic screens it provides but it seemed to work anyway. This threw us off for a long time because I thought it was Hamachi not working properly because I'm on Windows 10, but this wasn't the case.
Anyway, I don't know if this stuff is obvious already for people still playing Civ IV multiplayer but it might help any new people (if any exist!).