What should I do if the DNS resolution status is abnormal? Reasons and quick handling methods

in daily network use, many people will encounter problems such as inaccessible websites, slow loading or prompting that domain names do not exist. Among them, abnormal DNS resolution status is one of the common incentives. This failure not only affects the total page browsing experience, but also may hinder the normal operation of online operations such as office and online shopping. This article will deeply analyze the causes of abnormal DNS resolution status, and provide a set of quick solutions to help users efficiently troubleshoot and solve such network failures, and restore a stable network access environment.

What are the common causes of abnormal DNS resolution status?

to solve the problem of abnormal DNS resolution state, it is first necessary to clarify the root cause of the failure, and there are obvious differences in the processing methods corresponding to different incentives.

1, the local network environment is unstable

when there are fluctuations in the local network, such as weak WiFi signal, loose network cable or router failure, the connection between the device and the DNS server will be interrupted or the data transmission will be lost, which will cause abnormal DNS resolution status. This kind of situation is usually accompanied by the overall network card, not only specific websites cannot be accessed, but most network applications will be affected.

2, DNS server configuration or failure

if the DNS server itself used by the device by default is faulty, or the configuration parameters are wrong, it will directly lead to abnormal DNS resolution status. For example, the operator's DNS server is overloaded, maintained, or the manually set DNS address is filled in incorrectly, which will make the device unable to convert the domain name to Internet Protocol Address normally, and eventually the website cannot be accessed.

3, the domain name itself is abnormal

the domain name has expired and not renewed, is in the filing review stage or is banned by the service provider, the DNS resolution status will also be abnormal. In this case, even if the network and DNS server are normal, the domain name itself does not have resolvable permissions, and naturally cannot complete the conversion process from the domain name to the Internet Protocol Address.

What are the quick troubleshooting methods for abnormal DNS resolution status?

determine the cause of the abnormal DNS resolution state, it is necessary to narrow the fault range through accurate troubleshooting to avoid wasting time through blind operation.

1, testing local network connectivity

first of all, you can test network connectivity by pinging the public Internet Protocol Address, such as ping 8.8.8.8, if you can receive a reply normally, it means that the local network basic connection is normal, and the problem of abnormal DNS resolution status is likely to occur in the DNS resolution link; if you can't receive a reply, you need to check the hardware connection or router settings of the local network first.

2, replacement equipment verification fault range

use other devices under the same network to try to access the same website, if other devices can access normally, indicating that the abnormal DNS resolution status is a configuration problem of the current device; if all devices cannot access, the fault may be in the network environment or public DNS server.

3, query domain name resolution status

with the help of online domain name resolution query tool, enter the inaccessible domain name to see if its resolution record is normal. If the tool shows that the domain name has no resolution record or abnormal status, then the root cause of the abnormal DNS resolution status is the domain name itself, you need to contact the domain name service provider to verify the status.

What are the quick methods for handling abnormal DNS resolution status?

clear the cause of abnormal DNS resolution state, you can take corresponding measures for different situations, quickly restore normal network access.

1, refresh the local DNS cache

the local device will cache the resolved domain name records. When the records expire or there is an error, the DNS resolution status exception will be raised. At this time, the cache can be flushed through the command line tool. Windows systems can enter ipconfig /flushdns at the command prompt, and Mac systems can enter sudo dscacheutil -flushcache at the end point. After execution, the error cache can be cleared and the correct resolution records can be retrieved.

2 Switch to a public DNS server

if the default DNS server is faulty, you can manually switch to the public DNS server, such as Google's 8.8.8.8, domestic 114.114.114.114, etc. These public DNS servers are highly stable and can effectively avoid abnormal DNS resolution status caused by operator DNS failure. When operating, you only need to modify the DNS address in the device network settings.

3, repair local network connection

If it is confirmed after troubleshooting that the DNS resolution status is abnormal caused by the local network problem, you can first check whether the network cable is plugged in tightly, whether the WiFi signal is normal, and then try to access the website after restarting the router and device. If the problem persists, you can contact the network operator to detect the line and equipment and troubleshoot the hardware failure.

4. How to prevent the abnormal DNS resolution state from happening again?

solve the current abnormal DNS resolution state, you can also reduce the probability of failure recurrence through some optimization measures to improve the stability of network use.

1 Set up an alternate DNS server

configure both the primary DNS and the standby DNS server in the device network settings. When the primary DNS server fails, the device will automatically switch to the standby DNS to avoid abnormal DNS resolution status caused by a single server failure. It is recommended to choose the DNS address of different operators or service providers to further improve reliability.

2. Regularly check the domain name status

For users who have their own domain names, they should regularly log in to the background of the domain name service provider to check the expiration time and filing status of the domain name, and complete the renewal and filing update in time to avoid the abnormal DNS resolution status caused by the domain name itself and affect the normal access of the website.

3, maintain the normal maintenance of network equipment

regularly restart the router, clean the dust of the device, check the stability of the network cable and WiFi signal, and ensure that the local network environment is in good condition. A stable network foundation can reduce the abnormal DNS resolution status caused by connection problems and improve the overall network experience.

To sum up, abnormal DNS resolution status is a common network failure, which involves many aspects such as local network, DNS server and domain name status. By first investigating and locating the root cause of the fault, and then taking targeted measures such as refreshing the cache, switching DNS, and repairing the network, the problem can be solved quickly. At the same time, doing preventive work such as backup DNS settings and domain name status checks can effectively reduce the probability of abnormal DNS resolution status and make network access more stable and smooth.