What happens if DNSSEC is misconfigured?
Common misconfigurations:
- Expired signatures (not renewed)
- Key mismatch (DS record does not match DNSKEY)
- Missing DS record at registrar
- Algorithm mismatch
Result:
- Validating resolvers return SERVFAIL
- Domain appears completely unreachable
- Email delivery fails entirely
- Website inaccessible
Worse than no DNSSEC:
- Without DNSSEC: works normally
- With broken DNSSEC: total failure for validating resolvers
Prevention:
- Monitor DNSSEC health
- Automate key rotation
- Test after any changes
- Invalid seals cause document rejection. Worse than no seal at all.
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