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Common DNS Mistakes That Cause Downtime
DNS / SSL4/2/20267 min read
Avoid fragile nameservers, broken A records, missing mail records, TTL mistakes, and migration errors.
DNS changes are small, but mistakes can make an otherwise healthy website unreachable.
Use Redundancy
Keep multiple authoritative nameservers and verify A, AAAA, CNAME, MX, TXT, and CAA records after changes.
Plan Migrations
Lower TTLs before moves, validate both old and new targets, and monitor resolution from multiple networks.
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