Webpage not available.

I have a couple of websites that I use extensively - Overstock.com and Ancestry.com.   For some reason when I try to access them now I get the message that the webpage is not available.  I get the message that  Google Chrome's connection attempt to www.ancestry.com was rejected. The website may be down, or your network may not be properly configured.   It says the connection is being refused.   It does this regardless of the browser being used to access them.   Internet Explorer gets the same results.   I have other computers at home and I am able to access the websites from the other computers.   

 

I'm wondering if Norton is blocking my access somehow?   Sorry, not real spiffy on software these days.