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

in the process of daily Internet access, many people have encountered webpage loading cards, domain names can not jump or even completely disconnected from the network. After investigation, it is often found that the root cause is DNS detection abnormalities. This problem may seem small, but it will directly affect office efficiency, entertainment experience and even the acquisition of important information. This article will comprehensively sort out the common causes of DNS detection abnormalities, combined with practical solutions, to help you quickly locate the problem and solve it, and can easily deal with it without complex professional knowledge.

What are the common causes of abnormal DNS detection?

to solve the abnormal problem of DNS detection, we must first clarify its triggering reasons, and different incentives correspond to different processing methods.

1, local network equipment failure

router or light cat runs for a long time, there may be cache overflow and program process disorder, which are common factors that cause DNS detection abnormalities. For example, the router has not been restarted for dozens of days, and the DNS resolution records stored internally are piled up, which will lead to new domain name requests that cannot be processed normally and detection abnormalities. In addition, hardware connection problems such as loose network cables and poor contact with light cat fiber optic interfaces will also interfere with the transmission of DNS signals and cause detection abnormalities.

2, the local DNS configuration error

many users in order to optimize the network speed, will manually modify the computer or mobile phone DNS server address, but if you enter the wrong Internet Protocol Address, or choose an unstable niche DNS service provider, it will directly lead to abnormal DNS detection. In addition, some antivirus software or firewall network protection rules may mistakenly intercept normal DNS resolution requests, and will also cause abnormal detection prompts.

3, operator DNS server failure

when the network operator's DNS server encounters traffic attacks, system maintenance or hardware failures, it will lead to a wide range of DNS detection abnormalities. In this case, a large number of users under the same operator will have the same problem. For example, the telecom DNS server in a certain area crashes, and almost all telecom users in the area cannot resolve the domain name normally.

How to quickly troubleshoot DNS detection abnormalities?

encounter DNS detection abnormality, blind operation will only waste time, according to the steps of troubleshooting to accurately locate the problem.

1, through the command line preliminary detection

press the Win + R key in the Windows system to open the running window, enter cmd to enter the command prompt, and then enter the ping command plus the common domain name, such as ping www.baidu.com, if the request timed out or the host cannot be found prompt, there is a high probability of DNS detection abnormalities. You can also use the nslookup command to directly query the Internet Protocol Address corresponding to the domain name. If a non-authoritative response is returned or the resolution fails, it can also prove the existence of DNS detection abnormalities.

2, replace the network environment cross-validation

If the home WiFi is used and DNS detection is abnormal, you can switch to the mobile phone hotspot network and try to access the same domain name. If the hotspot network can be accessed normally, it means that the problem is in the DNS settings or devices of the home network; if the same DNS detection abnormality occurs under the hotspot network, it may be a problem at the local configuration or operator level of the device, further narrowing the scope of investigation.

What are the basic repair methods for DNS detection abnormalities?

for common DNS detection anomaly triggers, we can try some basic repair operations first, which can solve the problem in most cases.

1, restart the network device to clear the cache

this is the easiest way to solve DNS detection abnormalities, first unplug the power of the router and light cat, wait 30 seconds and then plug it back in, let the device completely restart and clear the internal cache. After restart, the device will re-obtain the latest DNS server address from the operator, and clear the accumulated resolution records. Most DNS detection abnormalities caused by cache overflow can be solved by this operation.

2, restore, or modify DNS server addresses

if the DNS is manually configured to detect abnormalities, you can restore the DNS settings to automatic acquisition, so that the device automatically obtains reliable DNS addresses from the operator. It can also be manually replaced with public DNS servers, such as domestic 114.114.114.114, 223.5.5.5, or foreign 8.8.8.8. These public DNS servers have strong stability and can effectively avoid DNS detection abnormalities.

Fourth, DNS detection abnormal advanced repair program?

if the basic method cannot solve the DNS detection anomaly, you need to try some advanced operations to fix the deeper problem.

1 Reset the network stack

some cases, the computer's network protocol stack is damaged or misconfigured, which will cause DNS detection abnormalities. At this time, you can enter netsh winsock reset and netsh int ip reset commands in sequence in the command prompt to perform the network protocol stack reset operation. After the operation is completed, restart the computer, the system will reinitialize the network configuration, and many DNS detection abnormalities caused by protocol problems can be solved.

2, check the security software interception rules

open the antivirus software or firewall on the computer, find the settings related to network protection or DNS protection, and see if there are rules to intercept normal DNS requests. If you find that there are intercepted entries for common domain names or DNS server addresses, you can temporarily close the relevant protection rules, and then re-detect the DNS status to confirm whether the DNS detection is abnormal due to the misjudgment of the security software.

To sum up, DNS detection abnormalities are a high-incidence network problem caused by device failures, configuration errors, service provider problems, etc. When solving the problem, you can check the root cause through the command line and cross-verification, and then try to restart the device, modify the DNS address, and reset the protocol stack in turn. As long as you follow the steps step by step, you can quickly solve DNS detection abnormalities and restore a stable and smooth network access experience.