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Resolver field notes

What does DNS failure mean?

6 min readDNS Benchmark

Quick Answer

DNS failure means a device could not successfully resolve a domain name into the record needed to connect to the destination service.

DNS failure is a symptom, not a root cause. It means the name-resolution step did not complete successfully, but the reason can be local, upstream, or policy-related.

Step-by-step solutions

  1. Test whether the issue affects one domain or all domains.
  2. Flush cache and retry.
  3. Restart the network connection.
  4. Swap to another resolver.
  5. Compare results from a second device or mobile network.

Useful commands

Windows

nslookup dnsbenchmark.app
ping 1.1.1.1

macOS

dig dnsbenchmark.app
networksetup -getdnsservers Wi-Fi

Linux

resolvectl query dnsbenchmark.app
getent hosts dnsbenchmark.app

If the issue follows stale data, clear DNS cache is the next move. If the failure follows the resolver settings themselves, go to how to reset a DNS server.

FAQ

Is DNS failure the same as no internet?

Not always. The internet connection may still exist, but domains cannot be translated into usable addresses.

What causes DNS failure most often?

The most common causes are bad resolver settings, ISP outages, stale cache, router problems, or blocked DNS traffic.

Can DNS failure be temporary?

Yes. Resolver timeouts, overloaded servers, or unstable local networking can cause short-lived DNS failures.

How do I confirm DNS failure?

Try resolving the same domain with another resolver or device and compare whether the failure follows the network or the resolver.

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