What should I do if the DNS configuration is abnormal? Detailed explanation of common causes and handling methods

in the process of daily use of the network, many people have encountered page loading timeouts, domain name inaccessibility and even network connection errors. Among them, abnormal DNS configuration is a high trigger for such problems. Many users are not familiar with the concept of DNS, and they are often helpless when encountering problems. This article will start with the common reasons for abnormal DNS configuration, disassemble and troubleshoot the idea step by step, and then give specific treatment methods to help ordinary users easily locate and solve such network failures, and use the network smoothly again.

What conditions can cause DNS configuration exceptions?

to solve the problem of abnormal DNS configuration, we must first clarify its triggers, and the solutions corresponding to different scenarios are also different.

1, the local DNS server address error

many users will manually modify the DNS server address. If there is a digital error, punctuation misuse, or a DNS server address that is not available in itself, it will directly cause an abnormal DNS configuration, resulting in the domain name cannot be resolved normally. In addition, when some devices automatically obtain DNS addresses, such problems may also occur due to router allocation errors.

2, network environment fluctuation interference

when the network signal in the area is unstable, such as weak Wi-Fi signal, temporary failure of broadband line, or in an environment with strong electromagnetic interference, network data transmission will experience packet loss and delay, which will affect the normal transmission and reception of DNS resolution requests.

3, operator DNS service failure

some users default to use the DNS server provided by the operator, once the operator's DNS node maintenance, downtime or load is too high, the user equipment DNS resolution request can not be timely response, showing that the DNS configuration is abnormal domain name can not be accessed.

How to initially troubleshoot DNS configuration abnormalities?

find network abnormalities, do not rush to modify the settings, first through a few simple steps to troubleshoot whether the DNS configuration exception, and the general direction of the exception.

1, use the ping command to detect connectivity

in the command prompt of the computer or the end point tool of the mobile phone, enter the public Internet Protocol Address commonly used in ping, such as 8.8.8.8, if you can receive a response normally, indicating that the network itself is connected; then ping a common domain name, such as www.baidu.com, if there is a request timed out, you can basically determine that the DNS configuration is abnormal caused by domain name resolution failure.

2, check the local DNS server settings

enter the network adapter settings of the computer or the WLAN details page of the mobile phone to view the currently used DNS server address. If it is manually set, check whether the address is correct; if it is automatically obtained, you can try to switch to manually enter the public DNS address to test whether it can return to normal, so as to verify whether the DNS configuration is abnormal.

What are the specific repair methods for abnormal DNS configuration?

determine that the DNS configuration is abnormal, you can select the corresponding repair method according to the results of the previous troubleshooting, and quickly restore the network function.

1, fix the local DNS server address

if the address is manually set wrong, directly enter the network settings interface, delete the wrong address, enter the correct public DNS address, such as Google's 8.8.8.8, domestic 114.114.114.114; if it is automatically obtained exception, you can first change the DNS settings to manual, enter a reliable public DNS address, save and restart the network connection, most cases can solve the problem of abnormal DNS configuration.

2, refresh the local DNS cache

device will cache the resolved domain name information during use. When the cache data expires or there is an error, it will also cause a resolution failure related to abnormal DNS configuration. At this time, you can execute the command to refresh the cache through the command line tool. The computer Windows system can enter ipconfig /flushdns, the Mac system can enter sudo killall -HUP mDNSResponder, and the mobile phone can clear the DNS cache by restarting the device.

3, change the network environment or restart the device

if the DNS configuration is abnormal caused by the fluctuation of the network environment, you can try to connect to other available Wi-Fi networks, or switch to the mobile phone data network to test whether the domain name can be accessed normally; at the same time restart the router, computer or mobile phone, reset the network connection status, can also solve some temporary DNS configuration abnormal problem.

4. How to prevent DNS configuration abnormalities from happening again?

solve the current abnormal DNS configuration problem, you can also reduce the probability of similar failures in the future through some settings and habits.

1, choose a reliable public DNS server

compared to DNS servers automatically assigned by operators, some public DNS servers have higher stability and security, such as domestic 114.114.114.114 and Ali's 223.5.5.5, these server nodes are widely distributed and have strong load capacity, which can effectively reduce DNS configuration abnormalities caused by server failures.

2, regularly check the network settings status

develop the habit of regularly checking the network settings, especially whether the DNS server address is normal, and pay attention to the stability of the network connection. Once the signal is found to be weak, the loading is slow and other abnormalities, and timely troubleshoot whether the DNS configuration is abnormal. Early detection and early processing.

To sum up, abnormal DNS configuration is a common network failure, and its incentives cover local settings, network environment, operator services, etc. As long as you follow the steps of first investigating the cause, then corresponding repair, and finally prevention, you can quickly solve the problem. When using the network daily, choosing a reliable DNS server and regularly refreshing the cache can effectively reduce the probability of abnormal DNS configuration and make network use smoother.