What is the reason for domain name resolution error and unable to access the Internet?

The reasons why you cannot access the Internet due to domain name resolution errors are: 1. There is a problem or configuration error with the DNS server, and the domain name cannot be correctly resolved; 2. There is a delay in domain name resolution, resulting in the inability to obtain the correct IP address in time when accessing the website. ; 3. There are incorrect or expired DNS records in the local DNS cache; 4. The domain name is not registered or has been canceled, and the DNS server cannot find the IP address corresponding to the domain name; 5. The router's DNS configuration is incorrect, preventing the device from correctly resolving domain name.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

The reasons why domain name resolution errors lead to inability to access the Internet may be as follows:

1. DNS server problem:

   DNS (Domain Name System) is the A system that converts domain names into IP addresses. When you enter a domain name in your browser, the system will query the DNS server for the corresponding IP address. If there is a problem or misconfiguration of the DNS server, the domain name cannot be correctly resolved, resulting in the inability to access the Internet.

2. Domain name resolution delay:

   Sometimes, domain name resolution may be delayed due to network problems or high load on the DNS server. This may cause you to be unable to obtain the correct IP address in time when accessing the website, causing the problem of being unable to access the Internet.

3. Local DNS caching issues:

   Your computer and network devices often cache recent DNS resolution results. If there are incorrect or expired DNS records in the cache, domain name resolution errors may occur. You can try clearing your local DNS cache to resolve the issue.

4. Domain name registration issues:

   In some cases, the domain name may not be registered correctly or may have expired. If the domain name is not registered or has been canceled, the DNS server cannot find the IP address corresponding to the domain name, resulting in inability to access the Internet.

5. Router configuration issues:

   If your router's DNS configuration is incorrect, it may prevent your device from properly resolving domain names. You can check your router settings and try changing to a reliable DNS server.

If you encounter the problem of domain name resolution error and unable to access the Internet, you can try the following steps to troubleshoot and solve:

1. Check other devices: Confirm Is there only one device that cannot access the Internet, or are all devices affected? This can help determine if the issue is with a single device or the network as a whole.

2. Check other websites: Try visiting different other websites to see if only a specific domain name cannot be resolved. This can determine whether it is a problem with a specific domain name or a problem with the entire domain name resolution system.

3. Clear the local DNS cache: In Windows systems, you can open the command prompt (CMD) and enter the command "ipconfig /flushdns" to clear the local DNS cache.

4. Change DNS Server: You can change your computer or router's DNS server settings to a reliable public DNS server, such as Google's 8.8.8.8 and 8.8.4.4. This avoids relying on the DNS servers provided by your ISP.

5. Contact your network service provider: If none of the above methods resolve the issue, it is recommended to contact your network service provider to report it to them and seek further technical support.

Please note that the specific situation may vary depending on network configuration and equipment, and it is recommended to choose an appropriate solution based on the specific situation.

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