Ubuntu: Some websites are not opening ex: www.edx.org,www.coursera.org but others are working



Question:

I have a tp link WiFi .I have upgraded from 14.04 to 16.04 .It's strange that some websites are not opening like www.edx.org, www.coursera.org but others are working fine.I don't understand how to correct this. Kindly help.


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