Can't connect to server

Hi, I made a script so I can connect 2 computers that have the same ip address. It works on one computer but the other computer with the same ip won't connect.

Here is the script:

 public string IP = "127.0.0.1";
     public int Port = 16900;
     
     public GameObject target;
 
     
     void OnGUI()
     {
         if(Network.peerType == NetworkPeerType.Disconnected)
         {
             if(GUI.Button(new Rect(100,100,100,25),"Start Client"))
             {
                 Network.Connect(IP,Port);
             }
             if(GUI.Button(new Rect(100,125,100,25),"Start Server"))
             {
                 Network.InitializeServer(10,Port);
             }
         }
         else {
             if(Network.peerType == NetworkPeerType.Client)
             {
                 GUI.Label(new Rect(100,100,100,25),"Client");
 
                 if(GUI.Button(new Rect(100,150,110,25),"Logout"))
                 {
                     Network.Disconnect(250);    
                 }
 
             }
                 
 
             if(Network.peerType == NetworkPeerType.Server)
             {
                 GUI.Label(new Rect(100,100,100,25),"Server");
                 GUI.Label(new Rect(100,125,100,25),"Connections: " + Network.connections.Length);
                 
                 if(GUI.Button(new Rect(100,175,100,25),"Logout"))
                 {
                     Network.Disconnect(250);    
                 }
                 if(GUI.Button(new Rect(100,150,110,25),"Change Color"))
                 {
                     GetComponent<NetworkView>().RPC ("ChangeColor", RPCMode.All);
                 }
             }
         }
     }
     
     [RPC]
     void ChangeColor()
     {
         Application.LoadLevel("Startvideo");
     }
     
 }