I am one of the Modder of this Stargate Mod. It is a bug with Version 1.0/1.1. I am sry. In Lan/Inet it is not possible to play with more than (!)3(!) player. If you want to play stargate empire at war in Lan you have to play with the Final 0.8, wait for the community Patch or our new Projekt Stargate - Empire at War Pegasus Chronicles for Forces of Corruption(Addon of Star Wars Empire at War).
For more Infos please visit http://www.moddb.com/mods/stargate-empire-at-war .