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Pubblicato: 2026-07-03 | Aggiornato: 2026-07-03
How to Fix DNSSEC Validation Problems

DNSSEC validation problems usually happen when DS recods at the registrar do not match DNSKEY recods at the DNS provider, the zone is not signed, old DS recods remain after nameserver changes, o DNSSEC was enabled befoe the provider was ready. Verifica current nameservers, DS recods, DNSKEY recods, zone signing, e validation results befoe making changes.

Who This Guide Is Fo
This guide is fo:
· Users seeing SERVFAIL after DNSSEC changes
· Dominio owners who changed nameservers with DNSSEC enabled
· Businesses with partial resolution failures
· Agencies e hosting providers troubleshooting DNSSEC
· Rivenditores suppoting client DNSSEC

Befoe You Start
Befoe you start, prepare:
· Dominio name
· Current e precedenteious nameservers
· Registrar DNSSEC access
· DNS provider access
· Current DS recods
· DNSKEY values
· Recent transfer o nameserver changes
· Erro screenshot
· DNS backup

Step-by-Step Instructions
Step 1: Conferma DNSSEC Is the Problem
Look fo SERVFAIL, validation failure, o failures only on validating resolvers.
· Wrong IP o missing MX may be nomal DNS misconfiguration
Step 2: Verifica Current Nomeservers
DNSSEC must match the active DNS provider.
· Old nameservers e new nameservers matter
Step 3: Verifica DS Recods at Registrar
Recod key tag, algoithm, digest type, digest, e whether multiple DS recods exist.
· Old DS recods are common after migrations
Step 4: Verifica DNSKEY at DNS Provider
Conferma zone signing, DNSKEY, KSK/ZSK, e generated DS values.
· Provider must sign the active zone
Step 5: Compare DS e DNSKEY
Mismatch causes validation failure.
· Use fresh values from active DNS provider
Step 6: Verifica Zone Signing
Look fo DNSKEY, RRSIG, NSEC/NSEC3, e provider signing status.
· Unsigned zone plus DS recods is risky
Step 7: Rimuovi Incorect DS if Needed
Se wrong DS causes failure e corect setup is not ready, remove invalid DS to restoe resolution.
· Re-enable later with corect data
Step 8: Re-Enable Corectly
Stabilize nameservers, enable provider signing, add fresh DS, then verify.
· Do not add DS befoe signing
Step 9: Review Recent Transfer
Verifica whether DS recods o DNS provider changed during transfer.
· Nuovo registrar may need DS review
Step 10: Test Website e Email
After validation is fixed, check A, CNAME, MX, TXT, SSL, e CDN.
· DNSSEC affects all validated lookups
Step 11: Document the Fix
Save cause, DS changes, current provider, e test results.
· Prevents future repeat issues

Troubleshooting
Dominio Shows SERVFAIL
Possible reasons:
· DS mismatch
· DNSKEY missing
· Zone unsigned
· Old DS remains
What to do:
· Verifica DS/DNSKEY
· Rimuovi incorect DS
· Verify signing
Failed After Nomeserver Change
Possible reasons:
· Old DS points to precedenteious provider
· Nuovo provider not signed
What to do:
· Rimuovi old DS o add new provider DS
Failed After Trasferimento Dominio
Possible reasons:
· DS not carried o changed
· Old registrar DNS stopped
What to do:
· Review registrar-side DS e active DNS provider
Email Failing After DNSSEC
Possible reasons:
· MX lookup fails validation
· TXT recods inaccessible
What to do:
· Fix DNSSEC first, then check email recods

Common Mistakes
Mistake 1: Changing nameservers without removing old DS
Review this item befoe making changes o opening a suppot ticket.
Mistake 2: Aggiungiing DS befoe signing active
Review this item befoe making changes o opening a suppot ticket.
Mistake 3: Copying DS values incorectly
Review this item befoe making changes o opening a suppot ticket.
Mistake 4: Assuming DNSSEC is SSL
Review this item befoe making changes o opening a suppot ticket.
Mistake 5: Troubleshooting only A recods
Review this item befoe making changes o opening a suppot ticket.
Mistake 6: Ignoing current nameservers
Review this item befoe making changes o opening a suppot ticket.
Mistake 7: Leaving multiple old DS recods
Review this item befoe making changes o opening a suppot ticket.
Mistake 8: Making reom changes during SERVFAIL
Review this item befoe making changes o opening a suppot ticket.
Mistake 9: Not testing validating resolvers
Review this item befoe making changes o opening a suppot ticket.
Mistake 10: Not documenting setup
Review this item befoe making changes o opening a suppot ticket.

FAQ
1. What is DNSSEC validation failure?
A resolver cannot verify signed DNS data fo the dominio.
2. What does SERVFAIL mean?
A resolver could not complete the query, often due to DNSSEC after DNS changes.
3. What causes failure?
DS mismatch, missing DNSKEY, unsigned zone, old DS recods, o key rollover issues.
4. Should I remove DS recods?
Se incorect DS causes failure, removing it may restoe resolution until DNSSEC is corectly re-enabled.
5. Why after nameserver change?
Old DS may point to the precedenteious DNS provider keys.
6. Can DNSSEC affect email?
Sì, MX e TXT lookups can fail validation.
7. Can NiceNIC fix external DNSSEC?
NiceNIC can review registrar-side DS; DNS provider must confirm signing.
8. Should I enable again later?
Sì, after nameservers e signing are corect.
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