What are the errors in domain name resolution? How to solve them?
DomainCn
DNS is the process of converting human-readable domain names into computer-recognizable IP addresses. However, sometimes you may encounter errors when performing DNS. These errors may result in the inability to access specific websites or services. In this article, we will explore some common DNS errors and provide methods to resolve them.
1. DNS Server Error:
A common DNS error is caused by a problem with the DNS server. When you cannot access a specific website or service, the first thing to do is to check if your computer or network has the DNS server configured correctly. You can try using different public DNS servers, such as Google Public DNS or Cloudflare DNS, to resolve this issue. The method for changing DNS server settings depends on the operating system and network settings you use.
2. TTL Expiration:
TTL (Time to Live) is a parameter related to DNS resolution that specifies the length of time a DNS record remains in the local DNS cache. If the TTL of a domain has expired, your computer may continue to use the expired resolution result, resulting in the inability to access the domain. The solution to this problem is to clear the local DNS cache. You can clear the DNS cache by executing "ipconfig /flushdns" (for Windows) or "sudo dscacheutil -flushcache" (for Mac) in the command prompt or terminal.
3. The domain name is not registered or expired:
If you cannot resolve a domain name, it may be because the domain name has not been registered or has expired. In this case, you need to confirm the registration status of the domain name and contact the domain name registrar to resolve the problem. The domain name registrar can provide information about the status and renewal of the domain name and help you resolve related issues.
4. DNS record errors:
Domain name resolution errors may also be caused by incorrect DNS record configuration. DNS records include A records, CNAME records, MX records, etc., which map domain names to corresponding IP addresses, aliases, or mail servers. If these records are not configured correctly, the resolution process may have problems. You can log in to the control panel or DNS management interface of the domain name registrar to check and update the relevant DNS records to ensure their correctness.
5. Domain name hijacking or DNS pollution:
In some cases, domain name resolution errors may be caused by domain name hijacking or DNS pollution. This means that your DNS request is redirected to the wrong IP address or a malicious server. To solve this problem, you can try to use a secure DNS resolution service, such as DNS over HTTPS (DoH) or DNS over TLS (DoT), to provide an encrypted and verified DNS resolution process, thereby reducing the risk of domain name hijacking and DNS pollution.
In summary, domain name resolution errors may be caused by a variety of factors, including DNS server problems, TTL expiration, unregistered or expired domain names, DNS record errors, and domain name hijacking or DNS pollution. Solutions to these problems include changing DNS server settings, clearing local DNS cache, confirming domain name registration status, checking and updating DNS records, and using secure DNS resolution services.
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