no connection could be made because the target machine actively refused it

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C#

C#4.0

When I trying to connect sockets I got below error message

no connection could be made because the target machine actively refused it

see my code

public void Connect1(string host, int port)
      {
          IPAddress[] IPs = Dns.GetHostAddresses(host);

          Socket s = new Socket(AddressFamily.InterNetworkV6,
              SocketType.Stream,
              ProtocolType.Tcp);

          txtPassWord.Text = "Establishing Connection to " + host;
          if(!s.Connected)
          s.Connect(IPs[1], port);
           txtPassWord.Text += "Connection established";
      }

I am passing my machine hostname and ip.

any suggestions appreciate...