DNS Troubleshooter
Find DNS failures, slow lookups, router configuration problems, and practical next steps.
Follow the checks in order. Your answers are used to create a repair-style diagnosis at the end. Commands shown below are for Windows and may require opening Command Prompt as Administrator.
1 Identify the DNS symptom
Select the option that most closely matches the issue you are seeing.
2 Check DNS server settings
Incorrect, unavailable, or slow DNS servers are a common cause of browsing problems.
3 Flush the DNS cache and renew your connection
A damaged DNS cache or expired network lease can prevent websites from resolving correctly.
4 Test DNS resolution directly
These tests help separate a DNS problem from a complete internet connection problem.
5 Check your router and internet provider
If several devices have the same problem, the router or internet provider may be supplying faulty DNS service.
6 Advanced network repair
Use this only if the earlier checks did not fix the problem. Restart your computer after running these commands.
Note: Resetting the network stack may remove saved network customizations, VPN settings, or firewall rules.