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Mastering DNS Server Issues: A Comprehensive Troubleshooting Guide

Troubleshooting DNS Server Issues: A Comprehensive Guide

Have you ever found yourself unable to access certain websites or experiencing slow internet speeds? It could be due to DNS server issues.

The Domain Name System (DNS) is responsible for translating domain names, such as, into IP addresses that computers can understand. When the DNS server encounters a problem, it can disrupt your internet connection.

In this article, we will explore common DNS server issues and provide troubleshooting steps to help fix them.

Resetting the Router

Sometimes, a simple router reset can resolve DNS server issues. By resetting the router, you are essentially restarting the connection between your devices and the internet.

This can help clear any temporary glitches or conflicts. When resetting the router, make sure to follow these steps:


Unplug the power cable from the router. 2.

Wait for about 30 seconds. 3.

Plug the power cable back in. This process allows the router to fully power down and then restart.

It can help resolve issues like IP conflicts or temporary router malfunctions.

Switching to Google DNS

If resetting the router doesn’t solve your DNS server problems, another option is to switch to a different DNS server. Most internet service providers (ISPs) automatically assign DNS servers to their customers, but using an alternative DNS server, such as Google DNS, can sometimes offer better performance and reliability.

To switch to Google DNS, follow these steps:

1. Open the Control Panel on your computer.

2. Click on “Network and Internet.”


Select “Network and Sharing Center.”

4. Click on “Change adapter settings” on the left side of the window.

5. Right-click on your active network connection and choose “Properties.”


Select “Internet Protocol Version 4 (TCP/IPv4)” and click on “Properties.”

7. Check the option “Use the following DNS server addresses.”


Enter the Google DNS server addresses: and

9. Click “OK” to save the changes.

By using Google DNS, you are bypassing your ISP’s DNS servers, which can sometimes be slow or unreliable. This switch can often result in a noticeable improvement in your internet speed and reliability.

Flushing the DNS Cache

Another troubleshooting step worth trying is flushing the DNS cache. Your computer’s DNS cache stores previously accessed website and IP address information.

Over time, this cache can become outdated or corrupt, leading to DNS server issues. Flushing the DNS cache clears this stored data and forces your computer to request fresh DNS information.

To flush the DNS cache, follow these steps:

1. Press the Windows key + R to open the Run dialog box.

2. Type “cmd” and press Enter to open the Command Prompt.

3. In the Command Prompt window, type “ipconfig /flushdns” and press Enter.

4. Wait for the process to complete and then close the Command Prompt.

Updating the Network Adapter Driver

Outdated or incorrect network adapter drivers can also cause DNS server problems. Updating the driver to the latest version available can help ensure compatibility with your operating system and fix any known issues.

To update the network adapter driver, follow these steps:

1. Press the Windows key + X and select “Device Manager” from the menu.

2. Expand the “Network adapters” category.

3. Right-click on your network adapter and select “Update driver.”


Choose the option to search automatically for updated driver software. 5.

Wait for the process to complete, and if a new driver is found, follow the on-screen instructions to install it. By keeping your network adapter driver up to date, you can avoid compatibility issues that may affect your DNS server connection.

Turning off the Windows Defender Firewall

In some cases, the Windows Defender Firewall can interfere with the DNS server, leading to connectivity issues. Temporarily turning off the firewall can help pinpoint whether it is the cause of the problem.

Note that disabling the firewall may expose your computer to potential security risks, so be cautious and only do this as a troubleshooting step. To turn off the Windows Defender Firewall, follow these steps:


Open the Control Panel on your computer. 2.

Click on “System and Security.”

3. Select “Windows Defender Firewall.”


Click on “Turn Windows Defender Firewall on or off” in the left pane. 5.

Choose the option “Turn off Windows Defender Firewall” for both private and public networks. 6.

Click “OK” to save the changes. Remember to turn the firewall back on once you have determined whether it was causing the DNS server issues.

In Conclusion

DNS server issues can be frustrating and disruptive. However, by following these troubleshooting steps, you can often resolve the problems on your own.

Resetting the router, switching to Google DNS, flushing the DNS cache, updating the network adapter driver, and turning off the Windows Defender Firewall are all useful techniques to try. By taking the time to troubleshoot and resolve DNS server issues, you can enjoy a smoother and more reliable internet experience.

In conclusion, troubleshooting DNS server issues is essential for maintaining a smooth and reliable internet connection. Resetting the router, switching to Google DNS, flushing the DNS cache, updating the network adapter driver, and turning off the Windows Defender Firewall are all effective methods to address these issues.

By taking these steps, you can avoid website access problems and slow internet speeds. Remember to regularly check and update your network equipment to ensure optimal performance.

With these troubleshooting techniques in your toolkit, you can navigate and resolve DNS server issues with confidence, ensuring a better online experience for yourself.

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