title: How to test if a remote server support tls1.2 on Mac OS
body: <p>I have googled and find </p>
  
  <p><a href="https://serverfault.com/questions/638691/how-can-i-verify-if-tls-1-2-is-supported-on-a-remote-web-server-from-the-rhel-ce">https://serverfault.com/questions/638691/how-can-i-verify-if-tls-1-2-is-supported-on-a-remote-web-server-from-the-rhel-ce</a>, </p>
  
  <p>the command: </p>
  
  <pre><code>openssl s_client -connect google.com:443 -tls1_2
  </code></pre>
  
  <p>does not work on MacOS because of "unknown option -tls1_2" error.</p>