Troubleshooting

The following topics are useful for troubleshooting DNS issues.

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FAQs — DNS Firewall

Troubleshooting DNSSEC

General DNS issues

Fix DNS_PROBE_POSSIBLE error

Fix DNS_PROBE_FINISHED_NXDOMAIN

Troubleshooting email issues

General FAQ

Unexpected _acme-challenge TXT records

Cannot verify a domain with CNAME

Existing NS records block new record creation

Exposed IP addresses

Cannot add DNS records with the same name

Stale response for upstream DNS resolution

Troubleshooting full setup

Cannot add domain to Cloudflare

Delete all DNS records

Domain deleted from Cloudflare

Troubleshooting secondary nameservers