DNS_PROBE_FINISHED_NXDOMAIN for single website

Question

I created this question 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:

Issue: A single site (one that I own), is showing server DNS address could not be found. DNS_PROBE_FINISHED_NXDOMAIN 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 mxtoolbox. 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.

What I've tried: 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.

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 earlier posing. Please let me know what other information I can provide. Otherwise, here are some details about the site itself:

Other information about my stack:

• Django web app
• Gunicorn / WSGI server
• Hosted on Heroku - Cedar-14 stack
• DNS setup with AWS route53
• domain name registered through AWS

EDIT:

Possibly related: https://serverfault.com/questions/606880/how-can-i-troubleshoot-a-route-53-hosted-zone

Answer 1

I had the similar issue and was not able to open Facebook. Rest all sites were working fine. Initially, I thought Facebook blocked me as I never faced this crappy issue earlier. Later when I searched in Google, I found an article which described the DNS_PROBE_FINISHED_NXDOMAIN issue on Chrome.

I just changed my DNS server address as 8.8.8.8 (preferred) and 8.8.4.4 (alternate) and I never faced that issue again.

Reference - https://www.mobipicker.com/dns_probe_finished_nxdomain/