What is the situation that the domain name cannot be resolved? Read the reasons and countermeasures in one article

in the process of daily visiting a website or building a site, many people have encountered page loading failure and browser prompts that the server cannot be found. This is likely to be caused by the inability to resolve the domain name. The inability to resolve the domain name seems to be a small problem, but it will directly lead to the inability of the website to access normally, causing no small trouble to individual users and business operations. This article will deeply analyze the common reasons why the domain name cannot be resolved, and at the same time give corresponding solutions to help you quickly locate the problem and restore the normal access of the website.

The domain name cannot be resolved? Check the status of the domain name itself first

domain name is the core carrier of resolution, and its own abnormal state is the common root cause of domain name resolution. First of all, we must start from the domain name itself.

1, the domain name has not completed the real-name authentication

According to the domestic domain name management regulations, all domain names must complete real-name authentication in order to use normally. If the authentication information is not submitted within the specified time or the authentication is not passed, the domain name will be suspended by the registrar to resolve the service, and then the domain name cannot be resolved. In this case, the user needs to log in to the domain name registration background to supplement the real-name authentication. After the review is passed, the domain name resolution service will automatically resume.

2, the domain name has expired or is locked

domain name has a fixed period of use. If the fee is not renewed in time after the expiration, the registrar will suspend the resolution first, and then take the domain name back and sell it again. In addition, if the domain name involves disputes, illegal use, etc., it will also be locked by the registrar or management agency, resulting in the domain name cannot be resolved. In case of such problems, you need to log in to the registration platform to check the status of the domain name. If it expires, renew the fee in time. If it is locked, you must contact the platform to understand the unlocking conditions and operate as required.

The domain name cannot be resolved? Troubleshoot DNS configuration problems

DNS is responsible for the core system of domain name resolution, its configuration problems will directly lead to the domain name can not be resolved, which is the need to focus on the investigation of the link.

1, DNS server address configuration error

whether it is a personal computer or a server, you need to configure the correct DNS server address to complete domain name resolution. If you manually set the wrong DNS address, or the automatically obtained DNS address fails, the domain name cannot be resolved. At this time, you can try to switch to a public DNS server, such as domestic 114.114.114.114, foreign 8.8.8.8, to test whether normal resolution can be restored.

2, domain name resolution record configuration error

domain name resolution needs to add corresponding resolution records in the registrar background, such as A records, CNAME records, etc. If the record type is selected incorrectly, the target address is filled in incorrectly, or the record is not valid, the domain name cannot be resolved. In this case, to log in to the domain name resolution background, check whether the type of resolution record and the target address are correct, and confirm whether the record has been completed and effective. Generally, it takes 10 minutes to 24 hours for the new or modified resolution records to be synchronized globally.

Can't resolve the domain name? Check the network and local environment

in addition to the domain name and DNS problems, the local network environment may also lead to abnormal domain name can not be resolved, which is easy to ignore the direction of investigation.

1, the local network connection is abnormal

if the local network is disconnected and the signal is unstable, the device cannot connect to the DNS server normally, and the domain name cannot be resolved will naturally occur. You can first check whether the router and network cable are connected normally, try to restart the router or switch the network, such as switching from WiFi to a mobile phone hotspot, and test whether the domain name can be resolved normally.

2, the local DNS cache is expired or corrupted

In order to improve the resolution speed, the device will automatically cache the domain name resolution result. If the cached record has expired, or the cache file is damaged, the domain name cannot be resolved. At this time, it can be solved by clearing the local DNS cache. The Windows system can enter the ipconfig /flushdns command in the command prompt, and the Mac system can enter the sudo dscacheutil -flushcache command through the end point to complete the cache clearance.

4, the domain name can not be resolved? Alert service providers and line failure

the normal operation of domain name resolution is inseparable from the support of the service provider, and the failure of the service provider or line will also cause the problem that the domain name cannot be resolved.

1, DNS service provider system failure

if you use a third-party DNS service provider, when the service provider's system malfunctions such as maintenance and downtime, the global domain name cannot be resolved. In this case, users can understand the situation by querying the service provider's official announcement and status page. If the failure lasts for a long time, they can temporarily switch to other stable DNS service providers, and then switch back after the original service provider is restored.

2, network operator line failure

the line failure of the network operator, the device cannot be connected to the DNS server normally, and then the domain name cannot be resolved. This kind of problem has regional characteristics, and users of the same operator will collectively have similar failures. Users can contact the operator's customer service to confirm the fault. After waiting for the operator to repair the line, the domain name resolution can return to normal.

sum up, the cause of domain name can not be resolved covers the domain name itself, DNS configuration, local environment and service provider lines and other levels, when encountering problems, you can check one by one from the domain name to the network, from the local to the service provider. First confirm whether the domain name status is normal, then check the DNS configuration and local cache, and finally check the service provider and line failure, you can quickly locate the problem and solve it, so that the website can resume normal access.