How Do I Fix the Problem My DNS Server Might Be Unavailable?


Larry Thompson

How Do I Fix the Problem My DNS Server Might Be Unavailable?

If you are experiencing issues with your internet connection, and you see an error message saying “DNS Server might be unavailable,” don’t worry. This is a common problem that can be easily fixed. In this tutorial, we will guide you through the steps to resolve this issue and get your internet working again.

What is a DNS Server?

A DNS (Domain Name System) server acts as a translator between domain names (e.g., and their corresponding IP addresses. When you enter a URL in your web browser, the DNS server translates it into an IP address so that your device can connect to the correct website or online service.

Common Causes of DNS Server Unavailability

There are several reasons why you might encounter the “DNS Server might be unavailable” error:

  • Your Internet Service Provider’s (ISP) DNS server is down
  • There is a problem with your router’s DNS settings
  • The Windows network configuration is incorrect
  • A firewall or antivirus software is blocking the connection

Steps to Fix the Problem

Follow these steps in order to fix the “DNS Server might be unavailable” problem:

Step 1: Restart Your Router and Modem

The first thing you should try is restarting your router and modem. Simply unplug them from the power source, wait for about 30 seconds, and then plug them back in. This can often resolve temporary network issues.

Step 2: Use a Different DNS Server

If restarting your router and modem didn’t solve the problem, you can try using a different DNS server. By default, your computer or router is configured to use your ISP’s DNS server. However, you can manually configure it to use a public DNS server like Google DNS or OpenDNS.

To change your DNS server settings in Windows:

  1. Click on the Start menu and go to “Settings”.
  2. Select “Network & Internet” and then click on “Change adapter options”.
  3. Right-click on your network connection and select “Properties”.
  4. Select “Internet Protocol Version 4 (TCP/IPv4)” and click on “Properties”.
  5. Choose the option to “Use the following DNS server addresses” and enter the IP addresses of the preferred and alternate DNS servers.
  6. Click “OK” to save the changes.

After changing the DNS server settings, check if the issue is resolved by accessing websites or online services.

Step 3: Flush DNS Cache

If changing the DNS server didn’t work, you can try flushing your computer’s DNS cache. The DNS cache stores information about previously visited websites, and sometimes it can become corrupted or outdated.

To flush the DNS cache in Windows:

  1. Open Command Prompt as an administrator. You can do this by typing “Command Prompt” in the search bar, right-clicking on it, and selecting “Run as administrator”.
  2. Type the command “ipconfig /flushdns” and press Enter.
  3. You should see a message saying that Windows successfully flushed the DNS Resolver Cache.

Step 4: Disable Firewall or Antivirus Software

In some cases, your firewall or antivirus software might be blocking the connection to the DNS server. Temporarily disable any firewall or antivirus software you have installed on your computer and check if the problem is resolved. If it is, you can add an exception for your DNS server in the firewall or antivirus settings.


If you are encountering the “DNS Server might be unavailable” error, follow the steps outlined in this tutorial to resolve the issue. Restarting your router and modem, changing your DNS server settings, flushing the DNS cache, and disabling firewall or antivirus software can often fix the problem. If none of these steps work, you may need to contact your ISP for further assistance.

Remember that troubleshooting network issues can vary depending on your operating system and network setup. These steps are specifically tailored for Windows users, but similar concepts apply to other platforms as well.

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