How to quickly troubleshoot DNS errors? A practical guide to detection and resolution

in the daily process of surfing the Internet, many people have encountered the failure of web page loading and the inability to jump to the domain name. Such problems are often hidden behind DNS errors. DNS errors will not only affect normal total page browsing, but also interfere with network use in important scenarios such as online office and video conferencing. This article will focus on the detection, troubleshooting and resolution of DNS errors, providing you with a set of practical operation guidelines to help you quickly locate the problem and restore network smoothness.

How to quickly detect whether there is a DNS error?

to solve the DNS error problem, the first step is to confirm whether the problem is indeed caused by the DNS error, rather than other network failures.

1, use the system's own command detection

Windows users can open the command prompt and enter the ping command plus the common domain name, such as ping www.baidu.com. If the request timed out or the host could not be found, there is a high probability of DNS errors; Mac or Linux users can open the end point and enter the same command for detection. In addition, you can use the nslookup command to directly query the Internet Protocol Address corresponding to the domain name. If an unexpected IP or resolution failure prompt is returned, it can also prove the existence of DNS errors.

2, check

there are many free online DNS detection tools on the market, such as DNS Checker, the DNS detection function of the webmaster tool, just enter the domain name to be queried, you can get the resolution results of multiple DNS servers, compare the resolution of different nodes, determine whether it is a local or global DNS error, but also intuitively see the resolution delay, effective status and other details.

What are the common causes of DNS errors?

clear the presence of DNS errors, it is necessary to investigate the specific causes of the problem in depth, different incentives correspond to different solutions, precise positioning can be efficiently solved.

1, local DNS cache exception

in order to speed up domain name resolution, the system will automatically cache the domain name information that has been resolved, but if the cached data is damaged or expired, it will cause DNS errors. For example, the Internet Protocol Address of the domain name has been updated, but the local cache still stays in the old data, which will lead to resolution failure. This kind of DNS error is more common after changing the network environment.

2, the local DNS server configuration error

most networks automatically assign DNS server addresses, if you manually set the wrong DNS server address, or the automatically assigned address itself is not available, it will directly lead to DNS errors. For example, mistakenly entering a non-existent Internet Protocol Address, or the DNS server of the current network fails, will make domain name resolution not work properly.

3, network operator DNS failure

part of the DNS error is caused by the network operator's DNS server failure, when the operator's DNS server downtime, congestion or abnormal resolution, all devices under the network will be affected, the page can not be resolved, such problems are usually universal, users in the same area will experience similar failures at the same time.

Practical solutions to DNS errors

find the cause of DNS error, you can take corresponding solutions according to the specific reasons, the following are several common and effective solutions.

1, clear the local DNS cache data

if it is a DNS error caused by a local DNS cache exception, clearing the cache can quickly solve the problem. Windows users can enter the ipconfig /flushdns command in the command prompt, which will prompt the DNS resolution cache to be successfully refreshed after execution; Mac users need to enter the sudo killall -HUP mDNSResponder command at the end point, enter the password to complete the cache clearance, and then try to access the web page. In most cases, it can return to normal.

2, reconfigure the DNS server address

If DNS errors caused by DNS server configuration errors are detected, you can choose to switch to the public DNS server address. Common public DNS include Ali DNS, Tencent DNS, 114DNS, etc., and the stability and resolution speed of these servers are guaranteed. Windows users can find Internet Protocol version 4 in the network adapter properties and manually enter the public DNS address; Mac users can configure it in the advanced options of network settings.

3, switch network environment verification repair

if it is suspected that the DNS error caused by the operator's DNS failure, you can try to switch the network environment, such as switching from home WiFi to mobile phone hotspots, or connecting to other available networks. If you can access the webpage normally after switching the network, it means that there is a problem with the DNS server of the original network. At this time, you can contact the operator to report the fault and wait for it to be repaired. You can also use the public DNS server for a long time to avoid such problems.

4. How to prevent DNS errors from happening again?

solve the current DNS errors, daily prevention can reduce the recurrence of such problems and improve the stability and fluency of the Internet.

1, regularly clean the local DNS cache

can develop the habit of cleaning the DNS cache regularly, such as once a week to avoid DNS errors caused by outdated or damaged cache data. You can also adjust the cleaning cycle according to your own Internet frequency. Users who go online more frequently can shorten the cycle appropriately and reduce the probability of abnormal cache.

2 Choose a stable public DNS server

compared to some operators of DNS servers, public DNS servers usually have higher stability and faster resolution speed, long-term use can effectively reduce the occurrence of DNS errors. You can choose the lowest latency public DNS server according to your network environment, and some tools can automatically detect and recommend the best DNS address.

sum up, DNS errors are common network problems in daily Internet access, but as long as you master the correct detection, troubleshooting and solution methods, you can quickly restore the normal use of the network. From first detecting and confirming the existence of DNS errors, to troubleshooting specific incentives, to taking corresponding solutions, and finally doing a good job of daily prevention, this complete process can help you deal with all kinds of DNS errors efficiently and make the Internet process smoother.