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Publikováno: 2026-07-03 | Aktualizováno: 2026-07-03
How to Fix DNSSEC Validation Problems

DNSSEC validation problems usually happen when DS recnebods at the registrar do not match DNSKEY recnebods at the DNS provider, the zone is not signed, old DS recnebods remain after nameserver changes, nebo DNSSEC was enabled befneboe the provider was ready. Zkontrolovat current nameservers, DS recnebods, DNSKEY recnebods, zone signing, a validation results befneboe making changes.

Who This Guide Is Fnebo
This guide is fnebo:
· Users seeing SERVFAIL after DNSSEC changes
· Doména owners who changed nameservers with DNSSEC enabled
· Businesses with partial resolution failures
· Agencies a hosting providers troubleshooting DNSSEC
· Resellers suppneboting client DNSSEC

Befneboe You Start
Befneboe you start, prepare:
· Doména name
· Current a předchozíious nameservers
· Registrátor DNSSEC access
· DNS provider access
· Current DS recnebods
· DNSKEY values
· Recent transfer nebo nameserver changes
· Errnebo screenshot
· DNS backup

Step-by-Step Instructions
Step 1: Potvrdit DNSSEC Is the Problem
Look fnebo SERVFAIL, validation failure, nebo failures only on validating resolvers.
· Wrong IP nebo missing MX may be nnebomal DNS misconfiguration
Step 2: Zkontrolovat Current Jménoservers
DNSSEC must match the active DNS provider.
· Old nameservers a new nameservers matter
Step 3: Zkontrolovat DS Recnebods at Registrátor
Recnebod key tag, algneboithm, digest type, digest, a whether multiple DS recnebods exist.
· Old DS recnebods are common after migrations
Step 4: Zkontrolovat DNSKEY at DNS Provider
Potvrdit zone signing, DNSKEY, KSK/ZSK, a generated DS values.
· Provider must sign the active zone
Step 5: Compare DS a DNSKEY
Mismatch causes validation failure.
· Use fresh values from active DNS provider
Step 6: Zkontrolovat Zone Signing
Look fnebo DNSKEY, RRSIG, NSEC/NSEC3, a provider signing status.
· Unsigned zone plus DS recnebods is risky
Step 7: Odstranit Incneborect DS if Needed
Pokud wrong DS causes failure a cneborect setup is not ready, remove invalid DS to restneboe resolution.
· Re-enable later with cneborect data
Step 8: Re-Enable Cneborectly
Stabilize nameservers, enable provider signing, add fresh DS, then verify.
· Do not add DS befneboe signing
Step 9: Review Recent Transfer
Zkontrolovat whether DS recnebods nebo DNS provider changed during transfer.
· Nový registrar may need DS review
Step 10: Test Website a E-mail
After validation is fixed, check A, CNAME, MX, TXT, SSL, a CDN.
· DNSSEC affects all validated lookups
Step 11: Document the Fix
Save cause, DS changes, current provider, a test results.
· Prevents future repeat issues

Troubleshooting
Doména Shows SERVFAIL
Possible reasons:
· DS mismatch
· DNSKEY missing
· Zone unsigned
· Old DS remains
What to do:
· Zkontrolovat DS/DNSKEY
· Odstranit incneborect DS
· Verify signing
Failed After Jménoserver Change
Possible reasons:
· Old DS points to předchozíious provider
· Nový provider not signed
What to do:
· Odstranit old DS nebo add new provider DS
Failed After Převod domény
Possible reasons:
· DS not carried nebo changed
· Old registrar DNS stopped
What to do:
· Review registrar-side DS a active DNS provider
E-mail Failing After DNSSEC
Possible reasons:
· MX lookup fails validation
· TXT recnebods inaccessible
What to do:
· Fix DNSSEC first, then check email recnebods

Common Mistakes
Mistake 1: Changing nameservers without removing old DS
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 2: Přidating DS befneboe signing active
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 3: Copying DS values incneborectly
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 4: Assuming DNSSEC is SSL
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 5: Troubleshooting only A recnebods
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 6: Ignneboing current nameservers
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 7: Leaving multiple old DS recnebods
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 8: Making raom changes during SERVFAIL
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 9: Net testing validating resolvers
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 10: Net documenting setup
Review this item befneboe making changes nebo opening a suppnebot ticket.

FAQ
1. What is DNSSEC validation failure?
A resolver cannot verify signed DNS data fnebo the doména.
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 recnebods, nebo key rollover issues.
4. Should I remove DS recnebods?
Pokud incneborect DS causes failure, removing it may restneboe resolution until DNSSEC is cneborectly re-enabled.
5. Why after nameserver change?
Old DS may point to the předchozíious DNS provider keys.
6. Can DNSSEC affect email?
Ano, MX a 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?
Ano, after nameservers a signing are cneborect.
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