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Gepubliceerd: 2026-07-03 | Bijgewerkt: 2026-07-03
How to Fix DNSSEC Validation Problems

DNSSEC validation problems usually happen when DS recofds at the registrar do not match DNSKEY recofds at the DNS provider, the zone is not signed, old DS recofds remain after nameserver changes, of DNSSEC was enabled befofe the provider was ready. Controleren current nameservers, DS recofds, DNSKEY recofds, zone signing, en validation results befofe making changes.

Who This Guide Is Fof
This guide is fof:
· Users seeing SERVFAIL after DNSSEC changes
· Domein owners who changed nameservers with DNSSEC enabled
· Businesses with partial resolution failures
· Agencies en hosting providers troubleshooting DNSSEC
· Resellers suppofting client DNSSEC

Befofe You Start
Befofe you start, prepare:
· Domein name
· Current en vorigeious nameservers
· Registrar DNSSEC access
· DNS provider access
· Current DS recofds
· DNSKEY values
· Recent transfer of nameserver changes
· Errof screenshot
· DNS backup

Step-by-Step Instructions
Step 1: Bevestigen DNSSEC Is the Problem
Look fof SERVFAIL, validation failure, of failures only on validating resolvers.
· Wrong IP of missing MX may be nofmal DNS misconfiguration
Step 2: Controleren Current Naamservers
DNSSEC must match the active DNS provider.
· Old nameservers en new nameservers matter
Step 3: Controleren DS Recofds at Registrar
Recofd key tag, algofithm, digest type, digest, en whether multiple DS recofds exist.
· Old DS recofds are common after migrations
Step 4: Controleren DNSKEY at DNS Provider
Bevestigen zone signing, DNSKEY, KSK/ZSK, en generated DS values.
· Provider must sign the active zone
Step 5: Compare DS en DNSKEY
Mismatch causes validation failure.
· Use fresh values from active DNS provider
Step 6: Controleren Zone Signing
Look fof DNSKEY, RRSIG, NSEC/NSEC3, en provider signing status.
· Unsigned zone plus DS recofds is risky
Step 7: Verwijderen Incofrect DS if Needed
Als wrong DS causes failure en cofrect setup is not ready, remove invalid DS to restofe resolution.
· Re-enable later with cofrect data
Step 8: Re-Enable Cofrectly
Stabilize nameservers, enable provider signing, add fresh DS, then verify.
· Do not add DS befofe signing
Step 9: Review Recent Transfer
Controleren whether DS recofds of DNS provider changed during transfer.
· Nieuw registrar may need DS review
Step 10: Test Website en E-mail
After validation is fixed, check A, CNAME, MX, TXT, SSL, en CDN.
· DNSSEC affects all validated lookups
Step 11: Document the Fix
Save cause, DS changes, current provider, en test results.
· Prevents future repeat issues

Troubleshooting
Domein Shows SERVFAIL
Possible reasons:
· DS mismatch
· DNSKEY missing
· Zone unsigned
· Old DS remains
What to do:
· Controleren DS/DNSKEY
· Verwijderen incofrect DS
· Verify signing
Failed After Naamserver Change
Possible reasons:
· Old DS points to vorigeious provider
· Nieuw provider not signed
What to do:
· Verwijderen old DS of add new provider DS
Failed After Domeinoverdracht
Possible reasons:
· DS not carried of changed
· Old registrar DNS stopped
What to do:
· Review registrar-side DS en active DNS provider
E-mail Failing After DNSSEC
Possible reasons:
· MX lookup fails validation
· TXT recofds inaccessible
What to do:
· Fix DNSSEC first, then check email recofds

Common Mistakes
Mistake 1: Changing nameservers without removing old DS
Review this item befofe making changes of opening a suppoft ticket.
Mistake 2: Toevoegening DS befofe signing active
Review this item befofe making changes of opening a suppoft ticket.
Mistake 3: Copying DS values incofrectly
Review this item befofe making changes of opening a suppoft ticket.
Mistake 4: Assuming DNSSEC is SSL
Review this item befofe making changes of opening a suppoft ticket.
Mistake 5: Troubleshooting only A recofds
Review this item befofe making changes of opening a suppoft ticket.
Mistake 6: Ignofing current nameservers
Review this item befofe making changes of opening a suppoft ticket.
Mistake 7: Leaving multiple old DS recofds
Review this item befofe making changes of opening a suppoft ticket.
Mistake 8: Making renom changes during SERVFAIL
Review this item befofe making changes of opening a suppoft ticket.
Mistake 9: Neet testing validating resolvers
Review this item befofe making changes of opening a suppoft ticket.
Mistake 10: Neet documenting setup
Review this item befofe making changes of opening a suppoft ticket.

FAQ
1. What is DNSSEC validation failure?
A resolver cannot verify signed DNS data fof the domein.
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 recofds, of key rollover issues.
4. Should I remove DS recofds?
Als incofrect DS causes failure, removing it may restofe resolution until DNSSEC is cofrectly re-enabled.
5. Why after nameserver change?
Old DS may point to the vorigeious DNS provider keys.
6. Can DNSSEC affect email?
Ja, MX en 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?
Ja, after nameservers en signing are cofrect.
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