The outage that wasn’t the application: a Route 53 DNS story

Internal business systems stopped resolving even though the servers were healthy. We traced the outage layer by layer to incomplete Route 53 delegation and restored access.

2 of 4 Route 53 nameservers configured at the registrar — the root cause
0 application or server changes needed

A medical equipment company hosts internal business applications on AWS EC2. One day the systems became unreachable at their normal addresses — while continuing to work perfectly by IP.

The challenge

Everything about the outage pointed away from the obvious suspects: EC2 instances were alive, the web servers responded, the application worked by IP address. Yet DNS queries for the domains returned NXDOMAIN, and employees could not reach the systems they use every day.

What we did

We debugged the production stack layer by layer instead of assuming the application was broken:

  • Confirmed compute, web server and application health — then isolated the failure to DNS delegation.
  • Verified the delegation chain with dig and dig +trace rather than trusting the registrar UI.
  • Found the root cause: only 2 of the 4 nameservers assigned to the Route 53 hosted zone were configured at the registrar.
  • Restored the full four-nameserver delegation set at the registrar, waited out propagation and re-tested resolution globally.

The outcome

Domain access came back without a single change to application code or servers — because the problem was never there. Incomplete delegation also explains why such outages look intermittent: resolver caches can hide the problem for some users until TTLs expire.

Production support is more than code support. DNS, hosting, deployment and monitoring decide whether users can actually reach a working system — which is why our maintenance covers the whole stack.

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industry

Medical equipment

tech stack

AWS Route 53, EC2, GoDaddy

service

Rescue & Incident Response

system risk check

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