Have you tried going to a specific page within the site instead of the homepage? Or going to it from a link instead? I had a similar problem with my email, and all I had to do was go to it from a link. It turned out that I was logged in to my email, so trying to load the log in page wasn't working. When I followed the link, it just took me to my in-box, and after I logged out it worked fine.
With the site chegg.com, I don't think this would be an issue, because the main page is not the log in page. But it may be worth trying out anyway.
Also, I found this on another site and it may be of use to you. It is for Firefox, but the procedure should be similar for IE and Chrome. The site he was having trouble with was his banking site, but he was getting the same error as you:
1) go to tools and click options
2) click on the advanced button and then click the network tab
3) then under connections click settings
4) click auto-detect proxy settings for this network.
So you say it was like that at your old house and again at your new house. Are you using both the same computers? Are your browsers all up to date? How about your anti-virus? And what AV are you using btw? What kind of add-ons do you have for each browser?