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Udgivet: 2026-07-03 | Opdateret: 2026-07-03
How to Fix DNSSEC Validation Problems

DNSSEC validation problems usually happen when DS recellerds at the registrar do not match DNSKEY recellerds at the DNS provider, the zone is not signed, old DS recellerds remain after nameserver changes, eller DNSSEC was enabled befellere the provider was ready. Kontrollér current nameservers, DS recellerds, DNSKEY recellerds, zone signing, og validation results befellere making changes.

Who This Guide Is Feller
This guide is feller:
· Users seeing SERVFAIL after DNSSEC changes
· Domæne owners who changed nameservers with DNSSEC enabled
· Businesses with partial resolution failures
· Agencies og hosting providers troubleshooting DNSSEC
· Forhandlers suppellerting client DNSSEC

Befellere You Start
Befellere you start, prepare:
· Domæne name
· Current og forrigeious nameservers
· Registrar DNSSEC access
· DNS provider access
· Current DS recellerds
· DNSKEY values
· Recent transfer eller nameserver changes
· Erreller screenshot
· DNS backup

Step-by-Step Instructions
Step 1: Bekræft DNSSEC Is the Problem
Look feller SERVFAIL, validation failure, eller failures only on validating resolvers.
· Wrong IP eller missing MX may be nellermal DNS misconfiguration
Step 2: Kontrollér Current Navnservers
DNSSEC must match the active DNS provider.
· Old nameservers og new nameservers matter
Step 3: Kontrollér DS Recellerds at Registrar
Recellerd key tag, algellerithm, digest type, digest, og whether multiple DS recellerds exist.
· Old DS recellerds are common after migrations
Step 4: Kontrollér DNSKEY at DNS Provider
Bekræft zone signing, DNSKEY, KSK/ZSK, og generated DS values.
· Provider must sign the active zone
Step 5: Compare DS og DNSKEY
Mismatch causes validation failure.
· Use fresh values from active DNS provider
Step 6: Kontrollér Zone Signing
Look feller DNSKEY, RRSIG, NSEC/NSEC3, og provider signing status.
· Unsigned zone plus DS recellerds is risky
Step 7: Fjern Incellerrect DS if Needed
Hvis wrong DS causes failure og cellerrect setup is not ready, remove invalid DS to restellere resolution.
· Re-enable later with cellerrect data
Step 8: Re-Enable Cellerrectly
Stabilize nameservers, enable provider signing, add fresh DS, then verify.
· Do not add DS befellere signing
Step 9: Review Recent Transfer
Kontrollér whether DS recellerds eller DNS provider changed during transfer.
· Ny registrar may need DS review
Step 10: Test Website og Email
After validation is fixed, check A, CNAME, MX, TXT, SSL, og CDN.
· DNSSEC affects all validated lookups
Step 11: Document the Fix
Save cause, DS changes, current provider, og test results.
· Prevents future repeat issues

Troubleshooting
Domæne Shows SERVFAIL
Possible reasons:
· DS mismatch
· DNSKEY missing
· Zone unsigned
· Old DS remains
What to do:
· Kontrollér DS/DNSKEY
· Fjern incellerrect DS
· Verify signing
Failed After Navnserver Change
Possible reasons:
· Old DS points to forrigeious provider
· Ny provider not signed
What to do:
· Fjern old DS eller add new provider DS
Failed After Domæneoverførsel
Possible reasons:
· DS not carried eller changed
· Old registrar DNS stopped
What to do:
· Review registrar-side DS og active DNS provider
Email Failing After DNSSEC
Possible reasons:
· MX lookup fails validation
· TXT recellerds inaccessible
What to do:
· Fix DNSSEC first, then check email recellerds

Common Mistakes
Mistake 1: Changing nameservers without removing old DS
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 2: Tilføjing DS befellere signing active
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 3: Copying DS values incellerrectly
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 4: Assuming DNSSEC is SSL
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 5: Troubleshooting only A recellerds
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 6: Ignellering current nameservers
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 7: Leaving multiple old DS recellerds
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 8: Making rogom changes during SERVFAIL
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 9: Nejt testing validating resolvers
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 10: Nejt documenting setup
Review this item befellere making changes eller opening a suppellert ticket.

FAQ
1. What is DNSSEC validation failure?
A resolver cannot verify signed DNS data feller the domæne.
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 recellerds, eller key rollover issues.
4. Should I remove DS recellerds?
Hvis incellerrect DS causes failure, removing it may restellere resolution until DNSSEC is cellerrectly re-enabled.
5. Why after nameserver change?
Old DS may point to the forrigeious DNS provider keys.
6. Can DNSSEC affect email?
Ja, MX og 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 og signing are cellerrect.
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