Due to all the hackings and problems its not that safe anymore to host on the public nexus. And becuase of that playing with others online is a problem. Sooo Heres the best thing to do to play multiplayer without a high chance of getting hacked.
Host one server in public and another in private. The public one can be used if others want to play as well. If the private crashes once you then know which person did it so change the port number to prevent the hacker from getting in again. Now host on the sfdc nexus with port # and the private one a different # to go into the private one you need to go via intranet first enter the ip and then : and the port number to reach the pirvate server. The private one obviously wont be on the sfdc nexus and can only be reached if the person knows the ip and the port number. So you could tell say Havik or Tovec the ip and port so they can play. Hope this helps and if I left anything else please tell me about it. (Playing in intranet will mean your score wont change) ;D
If you double click the SF Server program twice it should launch two times. Set your firewall to open the ports you will be using for the public and private server. Then tell your friends your ip and port number you use so they can play in the private one. The public one is for those who dont know about the private one yet.
*Note* If this is confusing I may have to try doing a screenshot guide so people will know how to do it.
Well I dont think anyone is playing SF now. I havent played in the past few months and plan to not play SF anymore until things get better (If they ever do) Ill still check the forums every now and then. If you wish to reach me I will be on IRC.