title: Why is the Azure Service Bus not influenced by firewalls and proxies?
body: <p>I'm wondering why the Windows Azure Service Bus works through NATs, firewalls, proxies. Microsoft mentions this fact often but they do not mentioned why this works.</p>
  
  <p>I think each participant initiates connections, ok, but this isn't enough. Do they "misuse" some open ports, 80?</p>
  
  <p>Thanks</p>