Hello,
Today after about one hour of pure frustration, i found a solution to a problem that alot of people are having.
Playing LAN over cracked versions of CoD5
Well, the deal here is simple. Download a .rar containing a .exe, start the game from the .exe then there should be no problems.
All you have to do is register at this forum to get it ( I dont kow how to upload .rar files >_< )
COD - world at war COOP LAN mod - debugger FORUM
Simple and super funny !