Simple listener to confirm a networking question I had on StackOverflow

Program.cs

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;

namespace ListenOnAny
{
    class Program
    {
        static void Main(string[] args)
        {
            var address = args.Length == 0 ? IPAddress.Loopback: IPAddress.Any;
            var port = 20000;
            var listener = new TcpListener(address, port);
            listener.Start();
            bool listening = true;
            var listenAction= new Action(() =>
            {
                while (listening)
                {
                    var socket = listener.AcceptSocket();
                    var remoteAddr = socket.RemoteEndPoint.ToString();
                    Console.WriteLine($"Got connected from {remoteAddr}. Closing now.");
                    socket.Close();
                }
            });
            var listenTask = new Task(listenAction);
            listenTask.Start();

            Console.WriteLine($"Listening on {port}. Press a key to end this");
            Console.Read();
            listening = false;
            listener.Stop();
        }
    }
}