Need help - TCP/IP server over home network

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C#

I'm trying to write a server (and client) application that will run in the following way:

Say you and I both have our machines connected to the same router in the same house.
I have my server running on my machine, and your machine connects to my server and say for example transfers some files.

I have managed to get this running on the same machine (ie server and client are both on one machine), however I have not been able to connect to the server on my machine from any other machine in the house.

Here's a code snippet from my server application:

this.tcpListener = new TcpListener(IPAddress.Any, 3000);
this.listenThread = new Thread(new ThreadStart(ListenForClients));
this.listenThread.Start();

And here is my client application:

IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 3000);
Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

Any help is appreciated. Thank you all in advance.