one pc open two application,and for using server to server ，how to config ?

and i want Gameserver connect to World using tcp,

this.ConnectToServerTcp(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 4520), "GameServer1", null);

but, GameServer connect to itself!

how can i config this ,

i want world application 's tcp listen port = 4520, and gameserver 's listen port = 4530

and if more applications ，how can i do ?