title: Setup Gunicorn with let's encrypt cert
body: <p>To secure my website, I've used Let's encyprt <code>certbot</code> for generating <code>privkey.pem, cert.pem, chain.pem, and fullchain.pem</code></p>
  
  <p>When I connect my website from desktop chrome or firefox, it seems to be ok. but when I connect mobile browser such as chrome-android, It blocks connection and shows <code>untrusted certificate authority</code>.</p>
  
  <p>I'm using Django==1.9.7 and gunicorn==19.6.0. and Here is my gunicorn configuration file:</p>
  
  <pre><code>bind = '0.0.0.0:443'
  workers = 4
  worker_class = 'gevent'
  worker_connections = 1000
  keepalive = 5
  
  keyfile = 'privkey.pem'
  certfile = 'cert.pem'
  </code></pre>
  
  <p>What am I missing?</p>