Websites like Media.net, jsFiddle.net, Mailchimp.com etc were not opening in my BSNL broadband. I tried changing DNS servers but still the problem persist. After changing MTU value in modem router setting I was able to see all the websites working.
If this solution doesn’t work then try changing the DNS servers IP Address.
Use DNS 18.104.22.168 and 22.214.171.124.