目标机器主动拒绝连接

Question

我认为这是由另一个应用程序使用的端口引起的，因此更改了端口号。我也关掉了防火墙，但我仍然遇到了这个例外。

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Runtime.Remoting.Channels.Tcp;
  using System.Runtime.Remoting;
  using System.Runtime.Remoting.Channels;

  namespace Server
  {
      class Server
  {
    static void Main(string[] args)
    {
        TcpChannel chan = new TcpChannel(4321);
        ChannelServices.RegisterChannel(chan,false);
      RemotingConfiguration.RegisterWellKnownServiceType(typeof(DsTutorial1.Greeting), 
            "Greeting", WellKnownObjectMode.SingleCall);
        Console.WriteLine("server is up");
        Console.WriteLine("waiting for clients");
        Console.ReadKey();


        }
    }
 }

.......

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

 namespace DsTutorial1
  {
    public class Greeting:MarshalByRefObject
   {
    String place="ll";
    String myGreeting="popo";

    Greeting()
    {
        this.place = "LAB 3";
        this.myGreeting = "hello from";
    }


    public String postGreeting()
    {

        return myGreeting+" "+place;
    }

     }
  }

....... 单击按钮时会触发异常，并突出显示内部的行 button1_Click方法。

 namespace Client
 {
     public partial class Form1 : Form
   {
    Greeting gt;
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        TcpClientChannel chan = new TcpClientChannel();
        ChannelServices.RegisterChannel(chan, false);
        gt = (Greeting)Activator.GetObject(typeof(Greeting), "tcp://Localhost:4321/ 

        Greeting");
    }

    private void button1_Click(object sender, EventArgs e)
    {
        MessageBox.Show(gt.postGreeting());
    }
  }
 }