I tried this code:
// Connecting...
TcpClient client = new TcpClient("k44.hopto.org", 7171);
NetworkStream stream = client.GetStream();
// Sending the request:
stream.Write(new byte[] { 6, 0, 255, 255 }, 0, 4);
byte[] b = Encoding.ASCII.GetBytes("info");
stream.Write(b, 0, b.Length);
//...