What does it mean when your DNS server is unavailable?

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Tags

1. #corrected
2. #browsers
3. #switching
4. #cases
5. #often
6. #problems
7. #troubleshooting
8. #temporarily
9. #traced
10. #outage
11. #these
12. #firewall
13. #settings
14. #server
15. #irritating
16. #restarting
17. #changing
18. #router
19. #messages
20. #unavailable