title: DNS_PROBE_FINISHED_NXDOMAIN for single website
body: <p>I created <a href="https://stackoverflow.com/questions/38295294/django-hsts-wsgi-site-cannot-be-reached?noredirect=1">this question</a> earlier but was told that it is a DNS issue as apposed to an issue with HSTS. Regardless, here is what I need help troubleshooting:</p>
  
  <p><strong>Issue</strong>:
  A single site (one that I own), is showing <code>server DNS address could not be found. DNS_PROBE_FINISHED_NXDOMAIN</code> when I try to connect to it via chrome, firefox, or safari. I can however connect to it via Tor Browser. I can also verify that the address resolves correctly using <a href="http://mxtoolbox.com/supertoolmobile.aspx" rel="nofollow noreferrer">mxtoolbox</a>. I also am not able to connect via two other computers and two other phones. I also am not able to connect via a different WIFI connection or personal hotspot via my phone. Curl and Host via the command line are also not able to get a response. </p>
  
  <p><strong>What I've tried</strong>:
  As I said above, I've tried different internet connections and computers. I've also tried flushing my DNS cache and pointing to another DNS server.</p>
  
  <p>Having said that, I am not sure how else to trouble shoot this. The only change I made to the web app was to add HSTS headers, hence why I created the <a href="https://stackoverflow.com/questions/38295294/django-hsts-wsgi-site-cannot-be-reached?noredirect=1">earlier posing</a>. Please let me know what other information I can provide. Otherwise, here are some details about the site itself:</p>
  
  <p>Other information about my stack:</p>
  
  <ul>
  <li>Django web app</li>
  <li>Gunicorn / WSGI server</li>
  <li>Hosted on Heroku - Cedar-14 stack</li>
  <li>DNS setup with AWS route53</li>
  <li>domain name registered through AWS</li>
  </ul>
  
  <p><strong>EDIT</strong>:</p>
  
  <p>Possibly related: <a href="https://serverfault.com/questions/606880/how-can-i-troubleshoot-a-route-53-hosted-zone">https://serverfault.com/questions/606880/how-can-i-troubleshoot-a-route-53-hosted-zone</a></p>