How to handle DNS exceptions? Practical steps and precautions

in the process of daily use of the network, many people have encountered problems such as page loading failure, domain name cannot be resolved, and network intermittent problems. Most of these conditions are related to DNS abnormalities. As the core bridge between domain name and Internet Protocol Address conversion, once an abnormality occurs, it will directly affect the stability of network access. This article will sort out the complete solution ideas of DNS abnormalities from self-inspection, repair, special scenario processing to prevention, etc., so that you can quickly troubleshoot and solve similar problems efficiently.

How to quickly self-check and locate DNS abnormalities?

want to solve DNS abnormalities, first of all to accurately determine whether the problem is indeed in the DNS link, to avoid blind operation waste time.

1, use the ping command to detect basic connectivity

press the Win + R key combination to open the running window, enter cmd into the command prompt, first ping common public Internet Protocol Address, such as 114.114.114.114, if you can receive a reply normally, indicating that the network link itself is no problem; then ping common domain names, such as www.baidu.com, if there is a request timed out or unable to resolve the prompt, the probability is caused by DNS abnormalities.

2 View local DNS server configuration

find Internet Protocol version 4 in the network connection properties, double-click Open to view the DNS server address. If the displayed address is empty, wrong, or does not match the standard address provided by the operator, it can also verify the existence of DNS exceptions. In addition, you can also enter the ipconfig /all command from the command prompt to quickly view the current DNS configuration information.

What are the general repair steps for DNS abnormalities?

confirmed that it is a DNS exception, the problem can be fixed through some general operations, which cover the vast majority of common DNS exception scenarios.

1, refresh the local DNS cache

system will automatically cache the domain name information that has been resolved. When the cache data expires or is corrupted, a DNS exception will be thrown. Enter the ipconfig /flushdns command in the command prompt, after execution, the local DNS cache will be emptied, and then the webpage will be re-visited. The system will re-obtain the latest resolution information. Many minor DNS exceptions can be solved by this operation.

2, manually replace the public DNS server

If the default DNS server is unstable or fails, replacing it with a public DNS server is an effective way to solve DNS abnormalities. Common public DNS have 114.114.114.114, 8.8.8.8, etc. In the DNS settings of the network connection properties, change automatic acquisition to manually enter these public DNS addresses, save and restart the network connection, you can try to restore normal access.

3 Reset the network stack

if none of the above methods can solve DNS abnormalities, it may be that the network protocol stack is damaged. In the command prompt, enter the netsh winsock reset and netsh int ip reset commands in sequence. After the execution is completed, restart the computer and reset the network protocol stack to the initial state. It can fix most DNS abnormalities caused by configuration confusion.

How to handle DNS exceptions in special scenarios?

in addition to the general situation, there are some special scenarios will also cause DNS exceptions, need to be targeted to solve the problem.

1, DNS exceptions caused by the router

many home networks automatically assign DNS addresses through the router. If the DNS configuration of the router itself is wrong or the firmware is abnormal, it will cause DNS abnormalities in the entire LAN. You can log in to the router management background, view the DNS server settings, change it to a public DNS address, or restart the router directly. If necessary, you can restore the router to factory settings and reconfigure it.

2, antivirus software or firewall blocking DNS

the security rules of some antivirus software or firewall are too strict, it may mistakenly intercept DNS resolution requests and cause DNS abnormalities. You can temporarily close the antivirus software and firewall and try to access the network. If it returns to normal, you need to add DNS resolution trust rules to the security software, or adjust the security protection level to avoid re-interception.

How to prevent DNS abnormalities from happening again?

solve DNS abnormalities, preventive measures can reduce the probability of subsequent problems and ensure long-term stability of the network.

1, regularly clean the local DNS cache

DNS cache is not cleaned for a long time, it will accumulate a lot of outdated or wrong resolution data, increasing the chance of DNS exceptions. You can set the ipconfig /flushdns command to be executed regularly every month to clean the local DNS cache, so that the system always gets the latest resolution information.

2 Choose a stable DNS server

give priority to the official DNS server provided by the operator, if the official DNS stability is not good, then choose a public DNS server with a good reputation, and you can configure the main and standby DNS addresses. When the main DNS is abnormal, the system will automatically switch to the standby DNS to ensure that the resolution service is not interrupted.

sum up, DNS abnormalities are common network faults, but as long as you master the correct troubleshooting and solution methods, you can quickly restore the normal network. From rapid self-examination and positioning problems, to general step repair, to targeted treatment of special scenarios, and finally take preventive measures to form a complete set of response processes, you can effectively solve all kinds of DNS abnormalities and make your network use smoother.