VS2013 怎么写服务端连接WebSocket

用VS2013 写了一个服务端，TCP的，参考了这位大神的例子https://www.cnblogs.com/codebirdhan/p/7462889.html
能用网络调试助手互相发信息。但如果是用WebSocket写的服务端连接，连上就会立即断，并且会发送一下信息。请问怎么解决。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Fleck;

namespace TopoWebSocket
{
class Program
{
static void Main(string[] args)
{
FleckLog.Level = LogLevel.Debug;
var allSockets = new List();
var server = new WebSocketServer("ws://0.0.0.0:7181");
server.Start(socket =>
{
socket.OnOpen = () =>
{
Console.WriteLine("Open!");
allSockets.Add(socket);
};
socket.OnClose = () =>
{
Console.WriteLine("Close!");
allSockets.Remove(socket);
};
socket.OnMessage = message =>
{
Console.WriteLine(message);
allSockets.ToList().ForEach(s => s.Send("Echo: " + message));
};
});

        var input = Console.ReadLine();
        while (input != "exit")
        {
            foreach (var socket in allSockets.ToList())
            {
                socket.Send(input);
            }
            input = Console.ReadLine();
        }
    }
}

}

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Fleck;

namespace TopoWebSocket
{
    class Program
    {
        static void Main(string[] args)
        {
            FleckLog.Level = LogLevel.Debug;
            var allSockets = new List<IWebSocketConnection>();
            var server = new WebSocketServer("ws://0.0.0.0:7181");
            server.Start(socket =>
            {
                socket.OnOpen = () =>
                {
                    Console.WriteLine("Open!");
                    allSockets.Add(socket);
                };
                socket.OnClose = () =>
                {
                    Console.WriteLine("Close!");
                    allSockets.Remove(socket);
                };
                socket.OnMessage = message =>
                {
                    Console.WriteLine(message);
                    allSockets.ToList().ForEach(s => s.Send("Echo: " + message));
                };
            });


            var input = Console.ReadLine();
            while (input != "exit")
            {
                foreach (var socket in allSockets.ToList())
                {
                    socket.Send(input);
                }
                input = Console.ReadLine();
            }
        }
    }
}