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no connection could be made because the target machine actively refused it
i need to know what is the problem and how can solve
i try to ping that (this access point take ip through tcp/ ip module )and that replay no problem

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net.Sockets;
using System.Threading;
using System.Runtime.Remoting.Channels;

namespace simple_tcpclient
    public partial class Form1 : Form
        public Form1()

        private void Form1_Load(object sender, EventArgs e)

            Connect("", "1");
          public static void Connect(String server, String message) 
    // Create a TcpClient. 
    // Note, for this client to work you need to have a TcpServer  
    // connected to the same address as specified by the server, port 
    // combination.
    int port = 1024;
    TcpClient client = new TcpClient(server, port);

    // Translate the passed message into ASCII and store it as a Byte array.
    Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);         

    // Get a client stream for reading and writing. 
   //  Stream stream = client.GetStream();

    NetworkStream stream = client.GetStream();

    // Send the message to the connected TcpServer. 
    stream.Write(data, 0, data.Length);

    System.Windows.Forms.MessageBox.Show("Sent: {0}" + message); ;         

    // Receive the TcpServer.response. 

    // Buffer to store the response bytes.
    data = new Byte[256];

    // String to store the response ASCII representation.
    String responseData = String.Empty;

    // Read the first batch of the TcpServer response bytes.
    Int32 bytes = stream.Read(data, 0, data.Length);
    responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);

    System.Windows.Forms.MessageBox.Show("recieved: {0}"+ responseData); 
    // Close everything.
   // stream.Close();         
   // client.Close();         
  catch (ArgumentNullException e) 
      System.Windows.Forms.MessageBox.Show("ArgumentNullException: {0}"+ e);
  catch (SocketException e) 
      System.Windows.Forms.MessageBox.Show("SocketException: {0}"+ e);

  System.Windows.Forms.MessageBox.Show("\n Press Enter to continue...");



1 solution

Your code connects to port 1024 of the host (

int port = 1024;
TcpClient client = new TcpClient(server, port);

According to exception - no service listens on this port at this host.

You can check if this port is open using telnet program

telnet 1024

To resolve - ensure, that on host some application listens to this port.
Share this answer
ameleed 7-Mar-13 4:18am    
Vyacheslav Voronenko
you mean insert that (telnet 1024)to my code . i already insert it to the code but it isn't identified how can i identify it ?
i am searching in this is exception and i find that may because of the firewall of my host ( block the call. so do you think the problem is in hardware or in my application
Vyacheslav Voronenko 7-Mar-13 6:37am    
What is the result of telnet 1024 command?

Connecting To not open connection to the host, on port 1024: Connect failed

Than problem is not in your application.
ameleed 9-Mar-13 7:17am    
yes i use this is to make telnet and service is not running what is the problem ?
Vyacheslav Voronenko 10-Mar-13 3:54am    
You do not need any C# here - it just allows you to simply check if smth listens to remote port or not.

From the command prompt.
ameleed 10-Mar-13 8:26am    
yes i made that from command prompt
and the result of telnet 1024
is could not open connection to the host on port connected failed
what can i do in this problem
may be firewall in my pc or firewall in the wireless access point or may be need to open port 1024
can you help me to find the solution

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