What should I do if the DNS server runs abnormally? Detailed reasons and handling methods

in the process of daily use of the network, many people have encountered problems such as page loading failure, domain name resolution failure, and intermittent network. Behind these failures, abnormal operation of DNS servers is one of the most common incentives. DNS, as the "address translator" in the network, is responsible for converting domain names into Internet Protocol Addresses that can be recognized by computers. Once it is abnormal, the entire network access process will be disrupted. This article will deeply analyze the various reasons for abnormal operation of DNS servers, and provide detailed troubleshooting and solutions to help you quickly restore normal network use.

What are the common causes of abnormal operation of DNS servers?

to solve the problem of abnormal operation of DNS servers, it is first necessary to clarify the root cause of the failure, different incentives correspond to different solutions, and accurate positioning can be efficiently repaired.

1, the local DNS configuration error

this is one of the common reasons for the abnormal operation of the DNS server. For example, if the user manually modifies the DNS address and enters the wrong IP address, or the DNS address automatically obtained by the system is deviated, the domain name cannot be resolved normally. In addition, some antivirus software or firewall network rules are not set properly, which may also intercept DNS requests and cause the illusion of abnormal operation of the DNS server.

2, DNS server itself failure

problems with the server itself that provides DNS services can also cause abnormalities. For example, the server encounters hardware failures, software program crashes, or the load is too high due to excessive access, which will affect its normal resolution function. In addition, some public DNS servers may temporarily stop serving due to maintenance upgrades, which will also cause the client to prompt that the DNS server is running abnormally.

3, network link abnormal interference

there is a problem with the network link between the user equipment and the DNS server, it will also cause the DNS server to run abnormally. For example, the router failure of the home network, the loosening of the network cable, or the failure of the operator's network node will cause the DNS request to not be delivered to the server normally, and then the domain name resolution will fail.

How to initially troubleshoot the abnormal operation of DNS server?

when the network access abnormality is found, first confirm whether the DNS server is running abnormally through simple troubleshooting steps to avoid wasting time by blind operation.

1, use the ping command to detect connectivity

enter the ping command in the command prompt of the computer, first try to ping the known public Internet Protocol Address, such as 8.8.8.8, if it can be connected normally, indicating that the network link is basically normal; then ping common domain names, such as www.baidu.com, if it cannot be connected, the probability is that the DNS server is running abnormally caused by domain name resolution failure.

2, replace the public DNS address test

replace the local DNS address with a well-known public DNS, such as Google's 8.8.8.8, domestic 114.114.114.114, and then try to access the web page again. If the network returns to normal, it means that there is a problem with the DNS server used before, further verifying the abnormal operation of the DNS server.

What are the specific repair methods for abnormal operation of DNS server?

after confirming the cause of abnormal operation of the DNS server, corresponding repair measures can be taken according to the specific situation to quickly restore the normal resolution function of the network.

1, fix the local DNS configuration

if the DNS server is running abnormally caused by a local configuration error, first open the network settings interface to check whether the current DNS address is correct. If an error is found, manually modify it to a reliable public DNS address. At the same time, check the network rules of antivirus software and firewall to turn off restrictions that may intercept DNS requests to ensure that DNS data packets can be transmitted normally.

2, refresh the local DNS cache

system's local DNS cache may store outdated or incorrect resolution records, which can also cause the DNS server to run abnormally. Enter the ipconfig /flushdns command at the command prompt, empty the local DNS cache, and then re-visit the domain name. The system will re-request the latest resolution records from the DNS server, which can often solve the problem quickly.

3, troubleshoot and repair network link problems

If the DNS server is running abnormally caused by abnormal network links, first check the hardware equipment of the home network, such as restarting the router and replacing the network cable to ensure stable network connection. If the problem persists, you can contact the network operator to inquire whether there is a regional network failure and ask the operator to assist in troubleshooting and repairing.

How to prevent DNS server operation abnormality from happening again?

solve the problem of abnormal operation of DNS server, take some preventive measures to reduce the probability of failure and improve the stability of network use.

1, configure multiple alternate DNS addresses

configure both the primary DNS and the standby DNS address in the network settings. When the primary DNS server is abnormal, the system will automatically switch to the standby DNS to avoid complete network interruption due to the abnormal operation of a single DNS server. It is recommended to choose public DNS from different service providers to improve the reliability of the standby plan.

2, regularly check the status of network equipment

regularly check network hardware devices such as routers and network cables, replace aging devices in time, and avoid abnormal operation of DNS servers due to hardware failures. At the same time, regularly restart the router, clean up the device cache, and maintain the stable transmission of network links.

To sum up, abnormal operation of DNS servers is a common fault that affects network access, and its incentives cover many aspects such as local configuration, server itself, and network links. Through preliminary investigation, the root cause of the problem can be quickly located, and then targeted methods such as correcting configuration, refreshing cache, and repairing links can be taken to solve the fault. Daily preventive measures, configuration of backup DNS, and regular inspection of equipment can effectively reduce the probability of abnormal operation of DNS servers and ensure smooth network use.