If the DNS resolution status is abnormal, you may not be able to access the Internet properly or have network connection problems. Here are some common DNS resolution exceptions and how to handle them:
1.The DNS server is unavailable
If you can't resolve any domain names, the first thing to do is to confirm that your DNS server is working. You can try using other reliable public DNS servers like Google Public DNS (8.)8.8.8) or Cloudflare DNS (1.)1.1.1）。Change the DNS server address in the operating system settings or router settings and check if it is back to normal.
2.The domain name resolution is incorrect
If only a specific domain name cannot be resolved, but other domain names can be resolved normally, it may be because there is a problem with the DNS records of a particular domain name. You can try flushing the DNS cache to clear the old records. On Windows, open a command prompt and run the ipconfig flushdns command. On your Mac, open the terminal and run the sudo killall -hup mdnsresponder command.
3.DNS contamination and hijacking
DNS contamination and hijacking can cause you to be redirected to the wrong ** or be subjected to malicious attacks. In this case, you can try using a VPN service or a server to avoid being hijacked. Also, make sure that your operating system and browser are all up to date and that you have effective antivirus and anti-malware tools installed.
4.DNS timeout
If the DNS resolution process takes longer than expected, it can cause the connection to time out or be delayed. You can try to change the local network settings, such as adjusting the DNS query timeout, increasing the DNS cache size, etc. Also, check that the network connection is stable and confirm if there are other network devices, such as routers, that are causing interference.
5.DNSSEC authentication issues
DNSSEC is a security mechanism used to verify the results of domain name resolution. If your network environment does not support DNSSEC or you are experiencing DNSSEC-related issues, you can try disabling DNSSEC validation. This is usually configured in the network settings or browser settings.
If the above methods do not resolve the DNS resolution status issue, it is recommended to contact your network service provider or system administrator to explain the problem and seek further help and support. They can provide more accurate solutions and adjust network settings on a case-by-case basis.