So I just downloaded EE : AOC and went to host a multiplayer game for my friend (who is still currently downloading) when I went to host I was greated with a error saying that my server key was incorrect.

Any help?

(I guess I will just get hamachi and host a LAN game for the time being)

multiplayer servers are turned off since 2008.

if you want to play EE online not only via LAN, please read this:

http://www.gog.com/en/forum/empire_earth_series/save_empire_earth_read_please
But im not sure if that thing is legal, so you may also use this client:

http://www.gameranger.com/

it still finds multiplayer games without problems for EE.

and for LAN Play and you have issues with Invaild CDKey issue, Check this LINK