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How to Fix DNS Issues

A practical DNS troubleshooting runbook for common domain connection failures.

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Diagnostic Sequence

Follow this order to isolate DNS problems without skipping critical checks.

Recommended workflow

  1. Confirm domain uses expected authoritative nameservers.
  2. Check target A/CNAME/MX/TXT records for typo or incorrect host.
  3. Validate no conflicting duplicate records exist.
  4. Inspect propagation from multiple resolver regions.
  5. Retest website and email behavior after DNS is consistent.

High-Frequency Errors

These mistakes cause most DNS support tickets.

Recommended workflow

  1. www alias misconfigured or missing CNAME.
  2. Wrong hosting IP after migration or environment change.
  3. MX record overwritten while editing website records.
  4. High TTL delaying expected update visibility.

When to Escalate

Escalate after finishing diagnostic steps and collecting evidence.

  • Domain and affected hostnames.
  • Timestamps and expected vs actual DNS values.
  • Public lookup results from at least two resolvers.
  • Submit details to KairoHost support.