How to handle DNS exceptions? DNS exception quick fix step guide

in the process of daily use of the network, many people have encountered web page loading failure, domain name cannot be resolved, and network frequent cards. Most of these problems are related to DNS abnormalities. DNS, as the domain name resolution system in the network, once an abnormality occurs, it will cut off the association between the domain name and the Internet Protocol Address, resulting in devices not being able to access network resources normally. This article will share practical methods for dealing with DNS abnormalities in an all-round way from troubleshooting, repair to prevention, and help you quickly solve network failures and restore a smooth Internet experience.

How to quickly troubleshoot DNS anomalies?

want to solve the DNS abnormal problem, first of all to accurately confirm the root cause of the fault, to avoid blind operation waste time, the following are several simple and efficient troubleshooting methods.

1, use the ping command to detect basic connectivity

press the Win + R key combination to open the running window, enter cmd to enter the command prompt, enter ping 8.8.8.8 and enter, if you can receive a reply normally, indicating that the network basic connectivity is normal, and the high probability is the domain name resolution problem caused by abnormal DNS; If there is a request timed out, it may be that the network link itself is faulty, and the network connection needs to be checked first.

2, use the nslookup command to resolve the domain name

also enter the nslookup www.baidu.com in the command prompt, if there is an unexpected Internet Protocol Address or prompt cannot be resolved in the returned resolution result, it is clear that the fault caused by the DNS exception; if the corresponding IP can be returned normally, it means that the DNS resolution function is normal, and other network problems need to be troubleshooted.

Second, DNS abnormal general quick repair steps

confirmed that it is a DNS exception, you can try these general repair steps first, and most common DNS exceptions can be resolved by these actions.

1, refresh the local DNS cache

device will automatically cache the resolved domain name information, once the cache data error will cause a DNS exception. Enter ipconfig /flushdns in the command prompt and press Enter to empty the local DNS cache and let the device get the latest resolution information again. This is one of the most basic operations to solve DNS exceptions.

2 Switching public DNS servers

if the default DNS server fails, it will also cause DNS abnormalities. You can enter the network settings interface and manually modify the DNS server address to public DNS, such as Google's 8.8.8.8, 8.8.4.4, or domestic 114.114.114.114. These public DNS servers are more stable and can effectively avoid DNS abnormalities caused by local DNS server failures.

3. DNS abnormal repair methods for different devices

there are differences in the network setting paths of different devices, for common devices such as computers and mobile phones, the following is the adaptation of DNS abnormal repair operations.

1, Windows computer DNS abnormal repair

In addition to the above general method, you can also enter the Network and Sharing Center of the Control Panel, click Change Adapter Settings, right-click on the currently used network connection to select Properties, find Internet Protocol Version 4 and double-click, select Use the following DNS server address, enter the public DNS address After confirming the setting, solve the DNS exception under the Windows system.

2, mobile device DNS abnormal repair

For Android devices, you can enter the WLAN settings, find the currently connected WiFi network, click Modify Network, tick Show Advanced Options, change the IP settings to static, and then enter the public DNS address in DNS1 and DNS2; Apple devices enter the WiFi settings, click the exclamation mark after the current network, select Configure DNS, and manually add the public DNS server address to fix the DNS abnormality of the mobile device.

4. How to avoid DNS exceptions from happening again?

solve the current DNS abnormality, taking preventive measures can reduce the probability of failure recurrence and improve the stability of network use.

1, clean DNS cache regularly

recommend manually cleaning the local DNS cache once a month to avoid DNS exceptions caused by outdated or incorrect cache data accumulation. You can also set up automatic cleaning with the help of third-party optimization tools to reduce the trouble of manual operation.

2 Choose a stable DNS server

preferentially choose the official DNS server provided by the operator, if DNS abnormalities often occur, you can switch to a public DNS server with a good reputation, and you can configure the main and standby DNS servers. When the main server fails, the device will automatically switch to the standby server, effectively reducing the probability of DNS abnormalities.

To sum up, DNS abnormalities are common network failures, and there are corresponding practical methods from rapid troubleshooting to targeted repair to later prevention. DNS abnormalities can be quickly located through ping and nslookup commands. Refresh cache and switch public DNS are universal repair methods. Different devices also have appropriate operation steps. Doing a good job in daily prevention can also reduce the recurrence rate of DNS abnormalities. Mastering these methods can calmly deal with DNS abnormalities and make network use smoother.