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Publicerad: 2026-07-03 | Uppdaterad: 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. Kontrollera current nameservers, DS recellerds, DNSKEY recellerds, zone signing, och validation results befellere making changes.

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

Befellere You Start
Befellere you start, prepare:
· Domän name
· Current och föregåendeious 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: Bekräfta 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: Kontrollera Current Namnservers
DNSSEC must match the active DNS provider.
· Old nameservers och new nameservers matter
Step 3: Kontrollera DS Recellerds at Registrar
Recellerd key tag, algellerithm, digest type, digest, och whether multiple DS recellerds exist.
· Old DS recellerds are common after migrations
Step 4: Kontrollera DNSKEY at DNS Provider
Bekräfta zone signing, DNSKEY, KSK/ZSK, och generated DS values.
· Provider must sign the active zone
Step 5: Compare DS och DNSKEY
Mismatch causes validation failure.
· Use fresh values from active DNS provider
Step 6: Kontrollera Zone Signing
Look feller DNSKEY, RRSIG, NSEC/NSEC3, och provider signing status.
· Unsigned zone plus DS recellerds is risky
Step 7: Ta bort Incellerrect DS if Needed
Om wrong DS causes failure och 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
Kontrollera whether DS recellerds eller DNS provider changed during transfer.
· Ny registrar may need DS review
Step 10: Test Webbsite och E-post
After validation is fixed, check A, CNAME, MX, TXT, SSL, och CDN.
· DNSSEC affects all validated lookups
Step 11: Document the Fix
Save cause, DS changes, current provider, och test results.
· Prevents future repeat issues

Troubleshooting
Domän Shows SERVFAIL
Possible reasons:
· DS mismatch
· DNSKEY missing
· Zone unsigned
· Old DS remains
What to do:
· Kontrollera DS/DNSKEY
· Ta bort incellerrect DS
· Verify signing
Failed After Namnserver Change
Possible reasons:
· Old DS points to föregåendeious provider
· Ny provider not signed
What to do:
· Ta bort old DS eller add new provider DS
Failed After Domänöverföring
Possible reasons:
· DS not carried eller changed
· Old registrar DNS stopped
What to do:
· Review registrar-side DS och active DNS provider
E-post 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: Lägg tilling 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 rochom 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.

Vanliga frågor
1. What is DNSSEC validation failure?
A resolver cannot verify signed DNS data feller the domän.
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?
Om 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 föregåendeious DNS provider keys.
6. Can DNSSEC affect email?
Ja, MX och 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 och signing are cellerrect.
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