DNS Troubleshooter
Diagnose DNS issues and restore connectivity step‑by‑step.
1 Identify the DNS symptom
Select what best describes your DNS issue.
What’s happening?
2 Check DNS server settings
Incorrect DNS settings are the #1 cause of DNS failures.
Which DNS servers are you using?
3 Flush DNS cache & reset resolver
Corrupted DNS cache can break name resolution.
Run these commands (Admin):
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
ipconfig /registerdns
ipconfig /release
ipconfig /renew
Did flushing DNS help?
4 Test DNS resolution manually
These tests show whether DNS is resolving correctly.
Run these commands:
nslookup google.com
nslookup microsoft.com
ping 8.8.8.8
ping google.com
nslookup microsoft.com
ping 8.8.8.8
ping google.com
What happened?
5 Check router DNS & ISP issues
Sometimes the router or ISP DNS servers are failing.
Router DNS status
ISP status
6 Advanced DNS repair
These commands reset the entire network stack.
Run these commands (Admin):
netsh winsock reset
netsh int ip reset
netsh advfirewall reset
netsh int ip reset
netsh advfirewall reset
Summary & Suggested Next Steps