title: How to test which version of TLS my .NET client is using?
body: <p>I support a .NET site which (amongst many, MANY, other things) talks to remote APIs from supplier systems.</p>
  
  <p>We want to upgrade to support TLS 1.2
  We're hoping to do so as per this question: <a href="https://stackoverflow.com/questions/4137106/are-there-net-implementation-of-tls-1-2">Are there .NET implementation of TLS 1.2?</a></p>
  
  <p>But how do I check that this is actually working once I've made the change.</p>
  
  <p>Ideally one of my supplier sites would start using TLS 1.2 <strong>ONLY</strong> and then my test could just be "can we talk to that supplier now?" But we don't have that.
  I'm guessing I can do something with a packet sniffer of some sort, but I wouldn't know what I was looking for exactly, nor how to set up the sniffer to be collecting the neccessary data in a readable manner.</p>
  
  <p>Either:</p>
  
  <ul>
  <li>Can someone point me in the direction of a comprehensive guide to how to collect that data in Fiddler/WireShark</li>
  </ul>
  
  <p>Or</p>
  
  <ul>
  <li>Can someone advise an alternative way to test that the change has worked.</li>
  </ul>