Troubleshooting

The following topics are useful for troubleshooting DNS issues.

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FAQs — DNS Firewall

Troubleshooting DNSSEC

Available debug endpoints

General DNS issues

Fix DNS_PROBE_FINISHED_NXDOMAIN

Fix DNS_PROBE_POSSIBLE error

Troubleshooting email issues

General FAQ

Troubleshooting full setup

Cannot add domain to Cloudflare

Delete all DNS records

Domain deleted from Cloudflare

Troubleshooting secondary nameservers

Cannot verify a domain with CNAME

Existing NS records block new record creation

Unexpected _acme-challenge TXT records

Exposed IP addresses

Cannot add DNS records with the same name

Stale response for upstream DNS resolution