How to solve dns resolution failure

Solutions to dns resolution failure: 1. Clear the DNS cache information; 2. Modify the HOSTS file; 3. Replace the local DNS server; 4. Check the network connection and DNS server status. Detailed introduction: 1. Clear DNS cache information. In Windows systems, you can solve the problem of DNS resolution failure by clearing DNS cache information. Open the command prompt and enter the command "ipconfig /flushdns" to clear DNS cache information; 2 , modify the HOSTS file, etc.

DNS resolution failure may cause a variety of problems, such as inability to access web pages, inability to send emails, etc. In order to solve the problem of DNS resolution failure, you can try the following methods:

1. Clear the DNS cache information

In Windows systems, you can solve the problem by clearing the DNS cache information. DNS resolution failure problem. Open the command prompt (CMD) and enter the following command: ipconfig /flushdns to clear the DNS cache information. If the problem is not resolved after clearing the cache, you can try restarting your computer or waiting for a while before trying to access the target website.

2. Modify the HOSTS file

The HOSTS file is a local file in the operating system that records the one-to-one correspondence between domain names and IP addresses. The corresponding relationship between domain names and IP addresses can be added or modified in the HOSTS file to speed up domain name resolution and facilitate LAN users to access intranet websites.

To modify the HOSTS file, you first need to find the location of the file. In Windows systems, the HOSTS file is usually located in the "C:\Windows\System32\drivers\etc\" directory. Open the directory, find the file named "hosts", and open it with a text editor (such as Notepad). Add a line to the HOSTS file in the format: domain name IP address, for example: example.com 192.168.0.1. Save the file and exit the editor.

After modifying the HOSTS file, you need to restart the computer to take effect. After restarting the computer, try to access the target website to see if the DNS resolution failure problem is resolved.

3. Replace the local DNS server

If the above two methods cannot solve the problem of DNS resolution failure, it may be caused by the local DNS server failure or attack. question. In this case, you can try changing the local DNS server to solve the problem.

You can try to use a public DNS server (such as Google DNS, OpenDNS, etc.) to replace the original local DNS server. Public DNS servers usually have higher reliability and security and can avoid problems caused by local DNS server failures or attacks.

When changing the public DNS server, you need to modify the computer's network settings and replace the original local DNS server address with the address of the public DNS server. The specific steps vary depending on the computer operating system and network settings. You can refer to relevant documents or search the Internet to learn how to modify the computer's network settings.

4. Check the network connection and DNS server status

If the above methods cannot solve the problem of DNS resolution failure, it may be due to network connection failure or DNS server failure. The problem. In this case, you need to check whether the computer's network connection is normal and whether the DNS server of the target website is running normally.

You can use the ping command to test whether the connection between the computer and the target website is normal. Enter ping the domain name or IP address of the target website in the command prompt. If it responds normally, the network connection is normal. If it does not respond properly, the problem may be caused by a network connection failure.

In addition, you can also check whether the service is running normally by querying the status of the DNS server. You can use the nslookup command to query the resolution results of a specific domain name. Enter the domain name or IP address of the nslookup target website in the command prompt. If the correct resolution result can be queried, the DNS server is running normally. If you cannot query the correct resolution results, it may be caused by a DNS server failure.

In short, solving the problem of DNS resolution failure requires investigation and repair from multiple aspects. You can first try to clear the DNS cache information, modify the HOSTS file, etc. to solve this problem. If none of the above methods can solve the problem, you can try changing the local DNS server or checking the network connection and DNS server status to further solve the problem.

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