Problem with agsXMPP

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using agsXMPP;
using agsXMPP.protocol.client;

namespace XMPPTest
{
    class Program
    {
        private static XmppClientConnection conn;

        static void Main(string[] args)
        {
            conn = new XmppClientConnection("jabber.cz");
            conn.UseStartTLS = true;
            conn.Username = "user";
            conn.Password = "password";
            conn.Resource = "test";
            conn.Priority = 5;
            conn.OnAuthError += new XmppElementHandler(conn_OnAuthError);
            conn.OnLogin += new ObjectHandler(conn_OnLogin);
            conn.OnError += new ErrorHandler(conn_OnError);
            conn.ClientSocket.OnValidateCertificate += new RemoteCertificateValidationCallback(ClientSocket_OnValidateCertificate);

            conn.Open();

            bool term = false;
            while (!term)
            {
                char c = (char)Console.Read();
                switch (c)
                {
                    case 'q':
                    case 'Q':
                        term = true;
                        break;

                    case 'm':
                    case 'M':
                        conn.Send(new Message("anotheruser@jabbim.cz", "hello"));
                        break;
                }
            }

            conn.Close();
        }

        static void conn_OnAuthError(object sender, agsXMPP.Xml.Dom.Element e)
        {
            Console.WriteLine("OnAuthError()");
        }

        static bool ClientSocket_OnValidateCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            X509Certificate2 cert2 = certificate as X509Certificate2;
            if (cert2 != null)
            {
                bool valid = cert2.Verify();
                return valid;
            }
            else
                return false;
}

        static void conn_OnError(object sender, Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }

        static void conn_OnLogin(object sender)
        {
            Console.WriteLine("OnLogin()");
        }
    }
}