How can we resolve switch (ns) DNS resolution failure?

If there is a DNS resolution failure when switching ns, you can try the following solutions: 1. Check your network connection: make sure your network connection is working properly. You can try restarting your router or connecting to a different network. 2. Clear DNS cache: in Windows, you can use the command prompt to clear the DNS cache. Open a command prompt window, type “ipconfig /flushdns”, and press enter. In Mac, you can use the terminal application, type “sudo killall -HUP mDNSResponder”, and press enter. 3. Change DNS server: try using a different DNS server for resolution. You can use public DNS servers, in Windows, you can change the DNS server address in the network adapter settings. In Mac, you can change the DNS server address in network preferences. 4. Check firewall and security software: sometimes firewalls or security software may block DNS resolution. You can try disabling these software to see if it resolves the issue. If it’s a firewall issue, you can try adding the necessary DNS resolution ports to the firewall exception list. 5. Reboot devices: sometimes simply restarting devices can resolve DNS resolution issues. You can try restarting your computer, router, and other related devices. If none of the above methods work, you can contact your network service provider or DNS server provider for further assistance.