How Do I Fix a DNS Server Problem?


Larry Thompson

If you’re experiencing issues with your internet connection, it could be due to a DNS server problem. DNS stands for Domain Name System and is responsible for translating domain names into IP addresses, allowing your browser to access websites. When there’s a problem with your DNS server, it can prevent you from browsing the web or accessing certain websites.

1. Check Your Internet Connection

Before diving into DNS troubleshooting, it’s important to ensure that your internet connection is working properly.

Make sure that your modem and router are turned on and connected correctly. If you’re using Wi-Fi, try connecting directly via an Ethernet cable to rule out any wireless issues.

2. Restart Your Router

A simple yet effective solution for fixing DNS server problems is to restart your router.

Power off the router by unplugging it from the power source, wait for about 30 seconds, and then plug it back in. Allow the router to fully reboot before attempting to reconnect.

3. Flush DNS Cache

Flushing the DNS cache can help resolve any conflicts or outdated entries that may be causing the issue.

Open Command Prompt (Windows) or Terminal (Mac), and type the following command: ipconfig /flushdns (Windows) or sudo killall -HUP mDNSResponder (Mac). Press Enter and wait for the process to complete.

4. Change Your DNS Server

If flushing the DNS cache doesn’t solve the problem, you can try changing your DNS server settings.

By default, your computer uses the DNS servers provided by your Internet Service Provider (ISP). However, using a different DNS server like Google Public DNS or Cloudflare may improve performance and reliability.

  1. On Windows, go to Control Panel > Network and Internet > Network and Sharing Center. Click on your active network connection, then select Properties. In the Properties window, double-click on Internet Protocol Version 4 (TCP/IPv4). Choose “Use the following DNS server addresses” and enter the preferred and alternate DNS server addresses.
  2. On Mac, go to System Preferences > Network.

    Select your active network connection, then click on Advanced. Go to the DNS tab and click on the “+” button to add a new DNS server. Enter the preferred and alternate DNS server addresses, then click OK.

5. Disable Firewall or Antivirus

In some cases, firewalls or antivirus software can interfere with your DNS settings and cause connectivity issues.

Temporarily disable your firewall or antivirus program to see if it resolves the problem. If it does, you may need to adjust the settings or whitelist certain applications or websites.

6. Restart Your Computer

Sometimes a simple restart can fix various network-related issues. Restarting your computer will clear any temporary files and reset network configurations, potentially resolving the DNS server problem.


A DNS server problem can be frustrating but is often easily fixable with a few troubleshooting steps. By checking your internet connection, restarting your router, flushing the DNS cache, changing your DNS server, disabling firewalls or antivirus programs when necessary, and restarting your computer, you can resolve most common DNS issues and get back online quickly.

Remember that these solutions may not work for everyone as different network configurations and setups may require additional troubleshooting steps or professional assistance.

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