Windows and other operating systems usually store the DNS data in the cache This cache also store data of the visited websites and clearing the cache may solve the problem.
To do that, click the Start button and type in cmd in the search box and press Enter from keyboard.
Disable the connections that you are not using by right clicking on them and then clicking Disable.
In the picture above I’ve right clicked on the network that I’m using because the other ones are already disabled.
As the DNS server your PC obtained automatically is not responding, you can change it to one of the most reliable DNS servers out there.
Open DNS and Google DNS are considered to be the best and they are totally free.At this point we will change the physical address of the computer.Go to Windows Start menu and type in cmd in the search box and hit Enter.While trying to browse the internet you may have encountered the error that says, DNS Server is Not Responding.It may also show up with the websites name along with the message ‘Server DNS Address Could Not be Found.’ Though it is not a very common problem but it occurs once in a while when the DNS server that translates a domain name doesn’t respond for any reason.You can also find the network connections by navigating to Start Change Adapter Settings.Now you will see all the connections that you are either using or not.Then in the Preferred DNS Server field type in 184.108.40.206 and in the Alternate DNS Server field type in 220.127.116.11 then check Validate Settings Upon Exit box and click OK. This will change the DNS servers on only the computer.If you are using internet on a mobile using a router then you can check out this post on how to change DNS servers on routers.But you can fix this problem easily by following the methods given below.Before trying anything complex, let’s do some basic tasks to narrow down the problem.