Thanks for all your replies.
Actually, I can use Firefox to access AN which makes it all the more strange. I use Kaspersky Internet Security. You can set exclusions under encrypted connections settings. Firefox now lets me in without requiring me to authorize, but not with Chrome which I prefer generally. It's just a pain to have to swap browsers each time to view, that's all. The problem is with Chrome, and the DNS change, I think. AN works in Chrome on my wife's laptop running Windows 7.