Question
What are common causes for DNS resolution failures that lead to Cloudflare Tunnel error 1033?
Asked by: USER1515
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93 Answers
Answer (93)
Common causes include: 1) Incorrect or missing DNS records (especially the CNAME record). 2) DNS server outages or instability. 3) TTL (Time To Live) values that are too high, causing old DNS records to persist. 4) Conflicts with other DNS entries or services. 5) Problems with the Cloudflare DNS servers themselves.