How to troubleshoot DNS resolution errors? Efficient detection and location methods

in the daily process of surfing the Internet, many people have encountered the failure of web page loading and the inability to access the domain name. Among them, DNS resolution errors are one of the most common incentives. This kind of failure may seem like a small problem, but it will directly affect office efficiency, entertainment experience and even business development. This article will detect the server from local to check, from basic operation to professional verification, and dismantle the DNS resolution error troubleshooting process for you in detail, so that you can quickly locate the problem and solve it, without being helpless due to network failures.

How to troubleshoot DNS resolution errors on the local side?

DNS parsing errors should start from the local network environment, which is the most common link of failures. The operation is simple and easy to use, and it is suitable for ordinary users to quickly self-check.

1, use the Ping command to detect connectivity

open the command prompt or end point of the computer and enter the Ping command of the target domain name. If the request timed out or the host could not be found is returned, it can basically determine that there is a DNS resolution error. If the Internet Protocol Address can be returned but the delay is too high, it may be a network link problem rather than a resolution failure, which can further distinguish the type of problem.

2, use the Nslookup command to verify the parsing results

enter Nslookup plus the target domain name on the command line. If the "server failure" or "domain name not found" prompt is returned, it means that the local DNS server cannot resolve the domain name normally, which is a typical DNS resolution error. If the returned Internet Protocol Address does not match the actual situation, it may be that the local DNS cache is abnormal, and it needs to be verified again after cleaning the cache.

3, clean the local DNS cache

local DNS cache expired or contaminated will also cause DNS resolution errors, Windows users can enter ipconfig /flushdns command at the command line, Mac users can clean up the cache through sudo killall -HUP mDNSResponder command, after cleaning up the attempt to access the domain name again, most basic failures can be resolved.

How to detect DNS resolution errors caused by DNS servers?

if the local detection does not find the problem, you need to focus on the DNS server, server failure or abnormal configuration is one of the core causes of DNS resolution errors.

1 Switch public DNS server test

switch the DNS server address of the local network to public DNS, such as 114.114.114.114 or 8.8.8.8, and then try to access the target domain name again. If it can be accessed normally, it means that the original DNS server is faulty, resulting in a DNS resolution error. You can temporarily use public DNS or contact the network operator to solve it.

2, detect the response speed of DNS server

use professional DNS detection tools, such as DNS Benchmark, to test the response speed and resolution success rate of different DNS servers. If the response time of a server is too long or the resolution success rate is less than 90%, the server is likely to cause DNS resolution errors. It is recommended to replace the more stable server address.

How to troubleshoot DNS resolution errors at the domain name configuration level?

for website managers or domain name holders, the abnormal configuration of the domain name itself is also an important incentive for DNS resolution errors, which needs to be checked from the domain name management background.

1, check the correctness of DNS records

log in to the domain name management background, check whether the A record, CNAME record, etc. are configured correctly, such as whether the A record points to the correct server IP, and whether the CNAME record is associated with a valid domain name. If the record is filled in incorrectly or the server pointed to is not available, it will directly lead to DNS resolution errors, and the configuration needs to be corrected in time.

2 Confirm the valid status of DNS records

DNS record modification usually takes 12 to 24 hours for the global effective time. If a DNS resolution error occurs just after the modification is completed, it may be that the record has not been synchronized to the global DNS node. You can check the effective range of the record through the global multi-node detection tool. If only some areas cannot be resolved, wait for the synchronization to complete.

3, check the registration status of the domain name

if the domain name expires and is not renewed, locked or in a disputed state, it will also cause DNS resolution errors. Log in to the domain name registrar to check the status of the domain name to ensure that the domain name is in a normal enabled state. If there is any abnormality, contact the registrar in time to solve it to avoid long-term resolution failures due to domain name problems.

4. The deep reason for the advanced verification DNS resolution error?

if the above troubleshooting does not find the problem, it is necessary to carry out advanced detection to troubleshoot DNS resolution errors caused by network links or external environments, which is suitable for user operations with a certain network foundation.

1 Detect DNS hijacking of network links

some network operators or malicious software will tamper with the resolution results through DNS hijacking, resulting in DNS resolution errors. By comparing the resolution results in different network environments, such as switching mobile phone hotspots or other WiFi, if the results are inconsistent, there is a high probability of hijacking, which can be avoided by modifying the DNS server to public DNS.

2 Trace the parsing path with Traceroute

enter Traceroute plus target domain name on the command line to view the transmission path of the resolution request. If there is a timeout or abnormal jump in a certain hop, it means that the node is faulty, resulting in DNS resolution errors that cannot be completed normally. You can contact the network operator to troubleshoot the link failure, or solve the problem by replacing the network line.

To sum up, DNS resolution error troubleshooting needs to follow the process from local to server, from basic to advanced, first complete the local self-test through Ping, Nslookup and other commands, then check the DNS server and domain name configuration, and finally locate the deep problem through advanced tools. As long as you follow this method to gradually troubleshoot, you can quickly find the root cause of DNS resolution errors and restore normal access to the network, whether ordinary users or website managers can easily get started.