Domain name resolution error means that when accessing a website, the domain name cannot be converted into the corresponding IP address, resulting in the inability to access the website normally. This is a common network problem, but for non-experts, it can be confusing and overwhelming. The following will introduce some common domain name resolution errors and their solutions, hoping to help everyone solve this problem.

First, we need to understand the principle of domain name resolution. When we enter a URL in the browser, such as www.example.com, the browser will send a query request to the local DNS server to ask for the IP address corresponding to the domain name. The local DNS server will answer this query request based on its own cache record. If there is no cache record, it will issue a query request to the root DNS server. The root DNS server will tell the local DNS server the IP address of the top-level domain name server corresponding to the domain name, and the local DNS server will then send a query request to the top-level domain name server. This process continues until the IP address corresponding to the domain name is finally found, and then the IP address is returned to the browser, and the browser can access the website through this IP address.

So, when a domain name resolution error occurs, how should we solve it? Here are some common solutions:

1. Check the network connection: First, make sure your network connection is normal. You can try to visit other websites to confirm whether the network is working properly.

2. Clear the DNS cache: Sometimes the cache of the local DNS server may be expired or incorrect, resulting in domain name resolution errors. You can try clearing the local DNS cache to resolve this issue. The specific operation methods may vary depending on the operating system. You can find corresponding tutorials through search engines.

3. Change the DNS server: If the problem still cannot be solved after clearing the DNS cache, you can try changing the DNS server. Normally, we use the default DNS servers provided by the operator, but sometimes these servers may be unstable or slow. You can try to use some public DNS servers, such as Google's 8.8.8.8 and 8.8.4.4, to see if the problem can be solved.

4. Check the firewall settings: Sometimes firewall settings can also cause domain name resolution errors. You can try temporarily turning off the firewall to see if that solves the problem.

5. Check whether the domain name is correct: Sometimes we may make spelling mistakes or input errors when entering the domain name. You can double-check whether the entered domain name is correct.

6. Contact the website administrator: If none of the above methods solve the problem, then there is probably a problem with the website itself. You can try contacting the site administrator and reporting the issue to them.

To sum up, domain name resolution errors are a common but troublesome problem. This problem can usually be solved by checking the network connection, clearing the DNS cache, changing the DNS server, checking the firewall settings, checking whether the domain name is correct, and contacting the website administrator. But if the problem persists, you may need to seek professional help for further troubleshooting and repair.