When you try to connect to the Internet, the connection might fail when we run the Troubleshooter, and you might get this error: The device or resource (DNS server) is not responding. The exact error would be:

You computer appears to be correctly configured, but the device or resource (DNS server) is not responding.

Fix DNS issues & problems

DNS Server is not responding

If you face DNS issues or problems on your Windows 10/8/7 computer, there are few things you could try to resolve it.

Before you begin, backup your Router settings and update the firmware of your Router. Check the Router manual for more information on this subject.

1] The fisrt thing to try is to change the DNS server address manually. Follow these instructions-

• Go to Start and Click on Control Panel
• Open up Network and Internet and go to the Network and Sharing Center.
• Click on Change adapter settings.

• Now you’ll see the list of Network adapters. Select the Network adapter that you are using and right-click on it and open Properties.

• Then Click on “Internet Protocol Version 4 (TCP/IPv4)”
• You’ll see the Internet Protocol Properties

• Select “Use the Following DNS server address:”
• Enter the Preferred DNS address:   208.67.222.222
• Enter the Alternative DNS address: 208.67.220.220
• Also select Validate settings upon exit check-box.

• Click OK, and then close to finish.

Now you have to enter the same DNS address in the Router configuration as well. You may refer the Router manual for more information on this.

2] If this does not help, you may try to install and configure OpenDNS and see if that helps.

3] The next suggestion I have to make is entering the Physical address in the Network adapter setting and seeing if that works for you. To do this-

• Go to Start and type in CMD and Hit Enter
• In command prompt type in IPCONFIG /ALL
• Look for your network adapter

• Write down the Physical Address. According to this screenshot it’s 78-DD-08-F1-DF-B0 in my case.
  

Now go to Start and type in NCPA.CPL. Right Click on your Network adapter and go to Properties.

Select Configure.

Then follow these steps-

• Click on Advance Tab and select Network address
• Select the radial button Value
• Type in the physical address you wrote down before, (In my case it was 78-DD-08-F1-DF-B0) Remove the dashes when you type in i.e. 78DD08F1DFB.
• Click OK
• Reboot the System.

Now look up your Network adapter model and go to the manufactures website and find the appropriate drivers and update the Drivers and see if that resolves your issue.

4] The last suggestion I have to make is to disable your Firewall completely and see if that helps your connection.

Hope something helps.

These resources may also interest you:

1. How to flush Windows DNS Cache
2. How to change DNS settings in Windows
3. Manage web browsing speed by changing DNS settings
4. DNS Cache Poisoning and Spoofing
5. Check if your DNS settings have been compromised.