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DNS Troubleshooting Basics
Fix common DNS issues quickly
This guide shows how to diagnose DNS problems: test resolution locally, clear caches, compare with alternate resolvers, and verify DNS records and TTLs.
- dns
- troubleshooting
- nslookup
- dig
- cache
Test resolution
Ping or nslookup the hostname; note if it resolves and to which IP.
Clear caches
Flush local DNS cache and restart resolver or device if needed.
Compare resolvers
Test with alternate DNS servers (e.g., public resolvers) to isolate issues.
Verify records
Check authoritative records and TTLs; ensure recent changes have propagated.