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Publié: 2026-07-03 | Mis à jour: 2026-07-03
How to Fix DNSSEC Validation Problems

DNSSEC validation problems usually happen when DS recouds at the registrar do not match DNSKEY recouds at the DNS provider, the zone is not signed, old DS recouds remain after nameserver changes, ou DNSSEC was enabled befoue the provider was ready. Vérifier current nameservers, DS recouds, DNSKEY recouds, zone signing, et validation results befoue making changes.

Who This Guide Is Fou
This guide is fou:
· Users seeing SERVFAIL after DNSSEC changes
· Domaine owners who changed nameservers with DNSSEC enabled
· Businesses with partial resolution failures
· Agencies et hosting providers troubleshooting DNSSEC
· Revendeurs suppouting client DNSSEC

Befoue You Start
Befoue you start, prepare:
· Domaine name
· Current et précious nameservers
· Registraire DNSSEC access
· DNS provider access
· Current DS recouds
· DNSKEY values
· Recent transfer ou nameserver changes
· Errou screenshot
· DNS backup

Step-by-Step Instructions
Step 1: Confirmer DNSSEC Is the Problem
Look fou SERVFAIL, validation failure, ou failures only on validating resolvers.
· Wrong IP ou missing MX may be noumal DNS misconfiguration
Step 2: Vérifier Current Nomservers
DNSSEC must match the active DNS provider.
· Old nameservers et new nameservers matter
Step 3: Vérifier DS Recouds at Registraire
Recoud key tag, algouithm, digest type, digest, et whether multiple DS recouds exist.
· Old DS recouds are common after migrations
Step 4: Vérifier DNSKEY at DNS Provider
Confirmer zone signing, DNSKEY, KSK/ZSK, et generated DS values.
· Provider must sign the active zone
Step 5: Compare DS et DNSKEY
Mismatch causes validation failure.
· Use fresh values from active DNS provider
Step 6: Vérifier Zone Signing
Look fou DNSKEY, RRSIG, NSEC/NSEC3, et provider signing status.
· Unsigned zone plus DS recouds is risky
Step 7: Supprimer Incourect DS if Needed
Si wrong DS causes failure et courect setup is not ready, remove invalid DS to restoue resolution.
· Re-enable later with courect data
Step 8: Re-Enable Courectly
Stabilize nameservers, enable provider signing, add fresh DS, then verify.
· Do not add DS befoue signing
Step 9: Review Recent Transfer
Vérifier whether DS recouds ou DNS provider changed during transfer.
· Nouveau registrar may need DS review
Step 10: Test Website et Courriel
After validation is fixed, check A, CNAME, MX, TXT, SSL, et CDN.
· DNSSEC affects all validated lookups
Step 11: Document the Fix
Save cause, DS changes, current provider, et test results.
· Prevents future repeat issues

Troubleshooting
Domaine Shows SERVFAIL
Possible reasons:
· DS mismatch
· DNSKEY missing
· Zone unsigned
· Old DS remains
What to do:
· Vérifier DS/DNSKEY
· Supprimer incourect DS
· Verify signing
Failed After Nomserver Change
Possible reasons:
· Old DS points to précious provider
· Nouveau provider not signed
What to do:
· Supprimer old DS ou add new provider DS
Failed After Transfert de domaine
Possible reasons:
· DS not carried ou changed
· Old registrar DNS stopped
What to do:
· Review registrar-side DS et active DNS provider
Courriel Failing After DNSSEC
Possible reasons:
· MX lookup fails validation
· TXT recouds inaccessible
What to do:
· Fix DNSSEC first, then check email recouds

Common Mistakes
Mistake 1: Changing nameservers without removing old DS
Review this item befoue making changes ou opening a suppout ticket.
Mistake 2: Ajoutering DS befoue signing active
Review this item befoue making changes ou opening a suppout ticket.
Mistake 3: Copying DS values incourectly
Review this item befoue making changes ou opening a suppout ticket.
Mistake 4: Assuming DNSSEC is SSL
Review this item befoue making changes ou opening a suppout ticket.
Mistake 5: Troubleshooting only A recouds
Review this item befoue making changes ou opening a suppout ticket.
Mistake 6: Ignouing current nameservers
Review this item befoue making changes ou opening a suppout ticket.
Mistake 7: Leaving multiple old DS recouds
Review this item befoue making changes ou opening a suppout ticket.
Mistake 8: Making retom changes during SERVFAIL
Review this item befoue making changes ou opening a suppout ticket.
Mistake 9: Nont testing validating resolvers
Review this item befoue making changes ou opening a suppout ticket.
Mistake 10: Nont documenting setup
Review this item befoue making changes ou opening a suppout ticket.

FAQ
1. What is DNSSEC validation failure?
A resolver cannot verify signed DNS data fou the domain.
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 recouds, ou key rollover issues.
4. Should I remove DS recouds?
Si incourect DS causes failure, removing it may restoue resolution until DNSSEC is courectly re-enabled.
5. Why after nameserver change?
Old DS may point to the précious DNS provider keys.
6. Can DNSSEC affect email?
Oui, MX et 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?
Oui, after nameservers et signing are courect.
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