What should I do if the DNS status is abnormal? Detailed reasons and quick handling methods

in the process of daily use of the network, many people have encountered slow loading of webpages, unable to open designated websites or even completely disconnected from the network. Among them, abnormal DNS status is one of the more common incentives. DNS, as the "address translator" in the network, is responsible for converting the domain name into the Internet Protocol Address that the server can recognize. Once it is abnormal, the entire network access process will be blocked. This article will deeply analyze the common causes of abnormal DNS status, provide you with a complete solution from the basic row to the professional repair, and share practical tips to prevent abnormal DNS status to help you quickly restore the normal use of the network.

What are the common causes of abnormal DNS status?

to solve the problem of abnormal DNS state, we must first clarify its trigger, and different incentives correspond to different repair directions.

1, network connection is unstable

when the network signal of the home or office environment fluctuates greatly, such as the WiFi signal is blocked by the wall, the router is too far away, or the operator's backbone network has a temporary failure, the communication between the DNS server and the device will be interrupted, which will lead to abnormal DNS status. In this case, it is often accompanied by other network problems such as web page loading card and video buffer failure.

2, DNS server itself failure

if the public DNS server used encounters traffic attacks, hardware failures or system maintenance, it will not be able to process domain name resolution requests normally, directly resulting in abnormal DNS status. For example, the operator DNS server in some areas will occasionally go down, and users will not be able to access most websites at this time.

3, the local DNS configuration error

input error when manually setting the DNS address, or the deviation of the DNS address automatically obtained by the system, the DNS status will be abnormal. In addition, some security software may mistakenly modify the DNS configuration file when optimizing the network, which will also cause the domain name resolution to fail.

2, DNS status abnormal basic troubleshooting how to do?

encounter an abnormal DNS state, start with the basic troubleshooting steps, and most simple problems can be solved quickly through these operations.

1, check the network physical connection

first confirm the network connection status of the device, WiFi users can check the signal strength, and wired users can check whether the network cable is plugged in tightly. Try to restart the router and light cat, wait for the device to reinitialize the network connection, and then test whether there is still an abnormal DNS status problem. Many temporary network fluctuations can be solved by restarting the device.

2, use the ping command to initially detect

enter "ping 8.8.8.8" in the command prompt of the computer, if you can receive a normal response, it means that there is no problem with the network connection itself, and the probability is that the domain name resolution caused by the abnormal DNS state fails; if there is no response, you need to solve the basic network connection first.

What are the quick repair methods for abnormal DNS status?

after completing the basic investigation, you can use the corresponding repair method for the specific situation of abnormal DNS status.

1, reset the local DNS cache

device will automatically cache DNS resolution records when visiting the website. Once the cached records expire or there is an error, it will cause a DNS status exception. Enter "ipconfig /flushdns" in the command prompt of the computer to empty the local DNS cache and let the device request the latest resolution records from the server again. This is one of the most common ways to solve DNS status exceptions.

2 Replacing public DNS servers

If it is determined that the DNS server currently in use is faulty, it can be replaced with domestic or international public DNS, such as Ali's 223.5.5.5, Google's 8.8.8.8, etc. Find the DNS configuration option in the network settings of the device, manually enter the new DNS address and save it, and then test the network access, generally can solve the abnormal DNS status problem.

3, fix the local DNS configuration

if the DNS address manually set before is incorrectly entered, or the security software modifies the configuration file, you need to enter the network settings interface to restore the DNS configuration to automatic acquisition, or re-enter the correct public DNS address. Some computer users can also check the hosts file to confirm that there is no maliciously tampered domain name resolution record to avoid abnormal DNS status due to configuration errors.

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

solve the current abnormal DNS status problem, preventive measures can reduce subsequent network troubles.

1, regularly optimize the network environment

regularly restart the router and light cat to clean the network cache of the device to avoid performance degradation caused by long-term operation of the device. At the same time, place the router in an open and unobstructed position to ensure the stability of the WiFi signal and reduce the abnormal DNS status caused by network fluctuations.

2 Set up an alternate DNS server

in the network settings of the device, in addition to the primary DNS address, add an alternate DNS address. When the primary DNS server fails, the device will automatically switch to the standby server, effectively reducing the probability of abnormal DNS status and ensuring the continuity of network access.

To sum up, abnormal DNS status is a common problem in daily network use, and its incentives cover network connections, server failures, configuration errors, etc. By basic troubleshooting and locating the root cause of the problem, and then using methods such as resetting the cache, replacing the server, and correcting the configuration, DNS status abnormalities can be quickly resolved. At the same time, preventive measures such as regularly optimizing the network and setting up backup DNS can effectively reduce the frequency of abnormal DNS status and make network use smoother.