Miért nem működik helyi hálózatban C# socket?

Server:

Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );

IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 11000);

listener.Bind(localEndPoint);

listener.Listen(100);

Client:

IPEndPoint remoteEP = new IPEndPoint(IPAddress.Parse("192.168.1.5"), 11000); //Szerver Ip cime: 192.168.1.5

Socket sender = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );

sender.Connect(remoteEP);