What is the domain name resolution exception? Troubleshooting guide for beginners

for newbies who have just come into contact with website operation, abnormal domain name resolution is a very easy problem to encounter. Once it occurs, it will directly lead to the failure of the website to access normally, which will bring no small trouble to users. Many people are often at a loss when facing such problems and do not know where to start troubleshooting. This article will sort out a set of clear and easy-to-understand troubleshooting logic for newbies to help everyone solve problems quickly and reduce the loss caused by website shutdown.

What is a domain name resolution exception?

to solve the problem of domain name resolution exception, we must first clarify its basic concept and understand its specific impact on the website.

1, the core definition of domain name resolution exception

domain name resolution is to convert an easy-to-remember domain name into an Internet Protocol Address that the server can recognize, so that users can access the corresponding website through the domain name. The domain name resolution abnormality refers to the failure of this conversion process, resulting in the domain name not being able to point to the corresponding IP normally, and eventually manifested as problems such as website failure, jump error or slow loading. It is one of the most common types of website access failures.

2, common manifestations of domain name resolution anomaly

domain name resolution abnormalities in various forms, the most intuitive is that the browser prompts can not access this website, some users will encounter domain name jump to unfamiliar pages, and some users will find that the website loading speed is extremely slow, multiple refreshes can not display the content normally, these may be the problem caused by domain name resolution abnormalities.

Common causes of domain name resolution abnormalities

find the cause of abnormal domain name resolution is the key to accurate troubleshooting and solving the problem. Novices can troubleshoot one by one from the following common directions.

1, domain name DNS server failure

DNS server is the core carrier responsible for domain name resolution. Once the DNS server is down, maintained or attacked, it will directly cause domain name resolution abnormalities. For example, some free DNS servers have poor stability and are prone to congestion during peak hours, resulting in untimely response to resolution requests, which in turn affects normal website access.

2, domain name resolution misconfiguration

novice in setting the domain name resolution record, it is easy to have configuration errors, such as A record pointing to the Internet Protocol Address fill in the wrong, MX record priority setting, or TTL value setting is unreasonable, these configuration errors will directly lead to domain name resolution exception, so that the domain name can not correctly point to the target server.

3, domain name status abnormal impact resolution

if the domain name is in an expired, unrenewed, locked or abnormal state of filing, it will also cause an abnormality in domain name resolution. After the domain name expires, the resolution record will be suspended and can only be restored after renewal; and the domain name is locked usually because it violates the registration rules. It needs to contact the domain name service provider to unlock it before it can be resolved normally.

rapid troubleshooting method for domain name resolution abnormalities

when encountering the situation that the domain name cannot be accessed, the novice can quickly troubleshoot through the following simple steps to determine whether the domain name resolution is abnormal and the specific point of failure.

1, use the ping command to detect the parsing result

enter ping plus domain name instruction in the command prompt of the computer, you can view the Internet Protocol Address of domain name resolution. If the displayed IP does not match the actual IP of the server, or prompts request timed out, you can basically determine the problem caused by the abnormal domain name resolution. This is the most basic and practical troubleshooting method.

2, with the help of online tools to detect the analysis status

there are many free domain name resolution detection tools on the Internet. These tools can detect domain name resolution from different regions and different DNS servers, and can more comprehensively determine whether there is a domain name resolution exception. If multiple regions show resolution failure, it means that the problem lies in the domain name resolution link, not the local network.

3, troubleshoot local DNS cache problems

the local device will cache the previous domain name resolution records. If the cache is not timely updated, there may also be an illusion of domain name resolution abnormalities. You can eliminate the interference caused by the local cache by clearing the local DNS cache and revisiting the domain name to see if the website can be opened normally.

Effective solutions to domain name resolution anomalies

determine the fault point of abnormal domain name resolution, you can take targeted measures to quickly restore normal access to the website.

1, fix the wrong configuration of domain name resolution

If the troubleshooting is found to be abnormal domain name resolution caused by misconfiguration, you need to log in to the domain name management background, carefully check the A records, MX records and other parameters, ensure that the Internet Protocol Address, priority and other information are filled in correctly, and wait for the TTL value to take effect after the modification is completed. Generally, normal resolution can be resumed within a few hours.

2, replace the stable DNS server

if the DNS server failure causes domain name resolution abnormality, you can consider replacing it with a more stable public DNS server, such as domestic 114DNS and Ali DNS. These servers have many nodes and strong stability, which can effectively reduce the probability of resolution failure. After replacement, you need to clear the local cache to take effect quickly.

3 Handling domain name status abnormalities

If the domain name resolution is abnormal due to abnormal domain name status, it is necessary to contact the domain name service provider in time to deal with it. If the domain name expires, complete the renewal as soon as possible. If the domain name is locked, submit relevant materials to apply for unlocking. If the filing is abnormal, you need to supplement the information according to the filing requirements. After the domain name status returns to normal, the resolution function will also be restored.

To sum up, abnormal domain name resolution is a common fault problem in website operation. As long as the novice masters its definition, incentives, troubleshooting methods and solutions, he can quickly respond. Daily attention should be paid to domain name status and resolution records, regular detection of resolution, and prevention in advance, which can effectively reduce the impact of abnormal domain name resolution and ensure the stable operation of the website.