What should I do if the DNS status is abnormal? Common causes and quick handling methods

in the process of daily use of the network, many people have encountered web page loading failure, domain name cannot be resolved, network card or even completely disconnected from the network. Among them, abnormal DNS status is one of the core reasons for such problems. Many users are not familiar with the concept of DNS, and they are often helpless when encountering such problems. They can only refresh the page repeatedly or restart the router. This article will deeply disassemble the common causes of abnormal DNS status, and give actionable and fast solutions in combination with actual scenarios to help everyone accurately locate and solve similar problems, and restore the normal use of the network as soon as possible.

What are the common manifestations of abnormal DNS status?

want to quickly solve the problem of abnormal DNS state, first need to accurately identify its typical performance, and avoid confusion with other network failures.

1, page loading failure error message

open the browser and enter the URL, the page is stuck in the loading state for a long time, and finally shows that the website cannot be accessed.

2, network application card or unable to connect

in addition to web pages, all kinds of applications that rely on the network will also be abnormal, such as chat software can not receive messages, online video can not be loaded, and games are frequently disconnected.

3, the network speed measurement is normal but cannot access the Internet

use the network speed measurement tool to show that the network speed is normal, but it is impossible to open any web pages or use network applications.

2. Common reasons for abnormal DNS status?

find the trigger cause of the abnormal DNS state is the key to accurately solve the problem, we can sort out from the three dimensions of hardware, server and local configuration.

1, network hardware equipment failure

long-term operation of network hardware such as routers and light cats will cause cache accumulation and hardware aging, resulting in DNS requests that cannot be forwarded normally, thereby triggering abnormal DNS status. In addition, loose network cables and interface oxidation will also affect the transmission of DNS signals, indirectly leading to resolution failure.

2, the DNS server itself

If you choose the operator's default DNS server, it may not be able to process domain name resolution requests normally due to server load, maintenance upgrades, regional failures, etc., and eventually cause DNS status abnormalities. Some niche public DNS servers may also have insufficient stability.

3, the local network configuration error

enter the wrong DNS address manually, or the network configuration of the computer or mobile phone is tampered with by malicious software, the device cannot connect to the correct DNS server, which directly causes an abnormal DNS status. In addition, the accumulation of local DNS cache will also cause the resolution information to expire, and the domain name cannot be recognized.

3. Quick troubleshooting method for abnormal DNS status?

determine that the DNS status is abnormal, we can accurately locate the root cause of the problem through a few simple troubleshooting operations.

1, use the ping command to test the parsing function

enter ping plus common domain names in the command prompt of the computer, such as ping www.baidu.com, if the request timed out or the host cannot be found, it means that the DNS status is abnormal and the resolution fails; if the Internet Protocol Address and delay data can be returned normally, it means that the DNS resolution function is normal, and the problem may be in other links.

2, switch the network environment to verify the fault range

if the computer has an abnormal DNS status, you can try to connect to the mobile phone hotspot, if the network returns to normal after the switch, the problem is in the original network DNS configuration or server; if the switch is still abnormal, it may be a problem with the configuration of the device itself.

3, check the local DNS cache status

enter ipconfig in the command prompt /displaydns can view the local DNS cache records, if there are a lot of expired or wrong records, it is likely to be the cause of the DNS state exception, then you can further clean the cache to verify that the problem is resolved.

IV. Quick solution for abnormal DNS status?

for the abnormal DNS status caused by different reasons, we can take corresponding solutions to quickly restore the normal use of the network.

1, restart the network hardware to clean the cache

this is one of the most basic and effective ways to solve DNS state abnormalities, first turn off the power of the router and light cat, wait 30 seconds and then restart in turn, let the device completely clean the cache and re-obtain the network configuration, most of the DNS state abnormalities caused by hardware cache accumulation can be solved in this way.

2, modify the DNS server address

if the DNS state is abnormal caused by the instability of the operator's DNS server, it can be manually replaced by a public DNS server, such as the domestic 114.114.114.114 and Alibaba Cloud 223.5.5.5.

3, clean the local DNS cache

enter ipconfig /flushdns in the computer command prompt to quickly clean up the local DNS cache, mobile phone users can turn on airplane mode and wait for 10 seconds to close, indirectly complete cache cleaning, which can effectively solve the DNS status caused by cache expiration.

To sum up, abnormal DNS status is a common type of failure in daily network use. Its performance covers various scenarios such as web page loading failure and application failure to connect. The inducements involve hardware failure, server problems, local configuration errors, etc. By identifying typical performance, troubleshooting the root cause of the problem, and taking corresponding treatment solutions, the problem of abnormal DNS status can be quickly solved. Regularly restarting network devices and cleaning DNS caches in daily use can also effectively reduce the probability of abnormal DNS status and ensure the smoothness of network use.