What to do if dns resolution fails

Solutions to dns resolution failure: 1. Refresh the DNS cache; 2. Change the DNS server; 3. Check the firewall settings; 4. Check the network connection; 5. Update the network driver; 6. Restart the router and modem ;7. Contact ISP. Detailed introduction: 1. Refresh the DNS cache. You can try to refresh the computer's DNS cache. In Windows systems, you can open the command prompt and enter the command "ipconfig /flushdns" to refresh the DNS cache, etc.

DNS (Domain Name System) resolution failure usually results in you being unable to access a specific website or service. This may be caused by network settings, DNS configuration, firewall issues, or ISP (Internet Service Provider) failure. The following are some possible solutions:

1. Refresh the DNS cache:

First, you can try to refresh your computer’s DNS cache. In Windows systems, you can open a command prompt and enter the command "ipconfig /flushdns" to flush the DNS cache. In Mac systems, you can use the command "sudo killall -HUP mDNSResponder" to flush the DNS cache.

2. Change the DNS server:

If your DNS resolution fails, it may be due to a problem with the DNS server you are currently using. You can try changing to other public DNS servers, such as Google's 8.8.8.8 and 8.8.4.4, or Cloudflare's 1.1.1.1 and 1.0.0.1. You can manually change the DNS server address in the network settings and then try to connect to the website or service.

3. Check the firewall settings:

Sometimes, the firewall settings may prevent DNS resolution. You can try turning off the firewall temporarily and try connecting to the website or service again. If the connection is successful, you need to reconfigure the firewall rules to ensure that DNS requests can pass normally.

4. Check the network connection:

Make sure your network connection is working properly. You can try to connect to other websites or services to check whether only specific websites or services are inaccessible. If other websites or services cannot be accessed, there may be a problem with your network connection, and you need to contact your ISP for troubleshooting.

5. Update the network driver:

If you are using a wired or wireless network connection, you can try to update the network adapter driver. Sometimes old or corrupt network drivers can cause DNS resolution to fail.

6. Restart the router and modem:

Sometimes, failure of the router or modem will also cause DNS resolution to fail. You can try restarting the devices and trying to connect to the website or service again.

7. Contact ISP:

If none of the above methods can solve the problem, it may be that your ISP is faulty, causing DNS resolution to fail. You can contact your ISP for more information and assistance.

To sum up, DNS resolution failure may be caused by a variety of reasons, including network settings, DNS configuration, firewall issues or ISP failures, etc. You can check one by one according to the above methods and hope to solve your problem. If the problem still cannot be solved, it is recommended to contact professional technical support personnel for further diagnosis and solution.

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