title: IdTCPClient sometimes connect to 224.0.0.252:5355
body: <p>I have a IdTCPClient on my application and my firewall inform me about an outgoing connection  to 224.0.0.252:5355. In the connection properties the used protocol is UDP.</p>
  
  <p>I've searched for "224.0.0.252" and found that it's an IP multicast address (Link-local Multicast Name Resolution)</p>
  
  <p>Q: Why IdTCPClient try to do that?</p>
  
  <p><img src="https://i.stack.imgur.com/I2Fns.gif" alt="enter image description here"></p>