What Causes DNS Server Failure?


Angela Bailey

In this tutorial, we will explore the various causes of DNS server failure. Understanding these causes can help you troubleshoot and resolve DNS issues effectively.

1. Network Connectivity Issues

Network connectivity issues can lead to DNS server failure. If your computer or network device cannot establish a connection to the DNS server, it won’t be able to resolve domain names into IP addresses.


  • Check your network cables and connections to ensure they are properly plugged in.
  • Restart your modem or router to reset the network connection.
  • Contact your Internet Service Provider (ISP) for assistance if you suspect a larger network issue.

2. Incorrect DNS Server Configuration

Incorrect DNS server configuration settings can cause failures in resolving domain names. This can happen if the primary or secondary DNS server addresses are entered incorrectly or if there are conflicts with other network settings.


  • Check your computer or router’s DNS settings and ensure they match the recommended configurations provided by your ISP.
  • If you are using a static IP address, make sure the assigned DNS server addresses are correct.
  • If you’re unsure about the correct settings, contact your ISP for assistance.

3. Firewall or Security Software Blocking DNS Requests

Firewall or security software on your computer may block outgoing DNS requests, causing server failure. These security measures are designed to protect your system but can sometimes interfere with essential network services like DNS resolution.


  • Temporarily disable your firewall or security software and check if DNS resolution works.
  • If disabling the software resolves the issue, adjust the settings to allow DNS requests.
  • Consult the documentation or support resources for your specific firewall or security software for guidance on configuring DNS-related permissions.

4. DNS Server Outages

DNS server outages can occur due to various reasons, such as maintenance, hardware failures, or network issues on the server-side. When a DNS server is down or unreachable, your system won’t be able to resolve domain names.


  • Check with your ISP or network administrator to determine if there are any reported DNS server outages.
  • If there is an outage, you may need to wait until the issue is resolved by the server administrator.
  • In some cases, temporarily switching to a different public DNS server may provide a temporary workaround until the original server is back online.

5. DNS Cache Issues

DNS cache issues can also cause problems with DNS resolution. Cached DNS records on your computer or router may become outdated or corrupted over time, leading to failed name resolution attempts.


  • Flush the DNS cache on your computer by opening a command prompt and running the command: ipconfig /flushdns.
  • If you suspect cache issues on your router, consult its documentation or contact the manufacturer for instructions on clearing the DNS cache.


In conclusion, there can be several causes for DNS server failure, including network connectivity issues, incorrect DNS server configuration, firewall or security software blocking DNS requests, DNS server outages, and DNS cache issues. By identifying the underlying cause and applying the appropriate solutions, you can resolve DNS problems and ensure smooth and reliable network connectivity.

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