How to test if a proxy server is working or not?

Question

I\'ve got a pretty big list with proxy servers and their corresponding ports. How can I check, if they are working or not?

Answer 1

Working? Well, you have to use them to see if they are working.

If you want to see if they are online, I guess ping is a first step.

There is a Ping class in .NET.

using System.Net.NetworkInformation;

private static bool CanPing(string address)
{
    Ping ping = new Ping();

    try
    {
        PingReply reply = ping.Send(address, 2000);
        if (reply == null) return false;

        return (reply.Status == IPStatus.Success);
    }
    catch (PingException e)
    {
        return false;
    }
}

Answer 2

I like to do a WhatIsMyIP check through a proxy as a test.

using RestSharp;

public static void TestProxies() {
  var lowp = new List<WebProxy> { new WebProxy("1.2.3.4", 8080), new WebProxy("5.6.7.8", 80) };

  Parallel.ForEach(lowp, wp => {
    var success = false;
    var errorMsg = "";
    var sw = new Stopwatch();
    try {
      sw.Start();
      var response = new RestClient {
        //this site is no longer up
        BaseUrl = "https://webapi.theproxisright.com/",
        Proxy = wp
      }.Execute(new RestRequest {
        Resource = "api/ip",
        Method = Method.GET,
        Timeout = 10000,
        RequestFormat = DataFormat.Json
      });
      if (response.ErrorException != null) {
        throw response.ErrorException;
      }
      success = (response.Content == wp.Address.Host);
    } catch (Exception ex) {
      errorMsg = ex.Message;
    } finally {
      sw.Stop();
      Console.WriteLine("Success:" + success.ToString() + "|Connection Time:" + sw.Elapsed.TotalSeconds + "|ErrorMsg" + errorMsg);
    }
  });
}

However, I might suggest testing explicitly for different types (ie http, https, socks4, socks5). The above only checks https. In building the ProxyChecker for https://theproxisright.com/#proxyChecker, I started w/ the code above, then eventually had to expand for other capabilities/types.

Answer 3

string strIP = "10.0.0.0";
int intPort = 12345;

  public static bool PingHost(string strIP , int intPort )
    {
        bool blProxy= false;
        try
        {
            TcpClient client = new TcpClient(strIP ,intPort );

            blProxy = true;
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error pinging host:'" + strIP + ":" + intPort .ToString() + "'");
            return false;
        }
        return blProxy;
    }

    public void Proxy()
    {
        bool tt = PingHost(strIP ,intPort );
        if(tt == true)
        {
            MessageBox.Show("tt True");
        }
        else
        {
            MessageBox.Show("tt False");
        }

Answer 4

try this:

public static bool SoketConnect(string host, int port)
{
    var is_success = false;
    try
    {
        var connsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        connsock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 200);
        System.Threading.Thread.Sleep(500);
        var hip = IPAddress.Parse(host);
        var ipep = new IPEndPoint(hip, port);
        connsock.Connect(ipep);
        if (connsock.Connected)
        {
            is_success = true;
        }
        connsock.Close();
    }
    catch (Exception)
    {
        is_success = false;
    }
    return is_success;
}