Flush DNS cache - solved server not found Error ~ GNIITHELP

If you know that your internet is working fine and still you are facing this error on visiting website's URL. Then below given solution can solve your problem.
Problem : 
Server not found
Firefox can't find the server at www.blogger.com. 

• Check the address for typing errors such as ww.example.com instead of www.example.com
• If you are unable to load any pages, check your computer's network connection.
• If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

Solution :
Step 1: Open Command prompt : Press Window Key + R, type cmd then click on OKbutton.

Step 2 : Type ipconfig /flushdns and press Enter. A message will appear statingWindows IP configuration Successfully flushed the DNS Resolver Cache.

Step 3 : Type exit on command prompt to close command prompt.