When you use VPN simulators like Hamachi and Tunngle, mostly you just need to put aoe (age2x_1.exe) as an exception in your firewall. (Also the simulator as well).

But if you want to use clients...

actually u don't need that... u can see your hamachi ip at the top of hamachi window. Also whoever creates the game, should give all others his (hamachi) IP and the network he is into, and if others...

yeah this is not related to game development but I can answer your questions...

1. Turn off your windows firewall and Anti-virus firewall. Then you should be able to join games.
2. If you don't...