Comcast DNS was not resolving several domains for me last week so I switched over to Google's DNS. Use 8.8.8.8 and 8.8.4.4 to switch if you can't resolve anything.
It's back up for what it's worth .. confirmed with a couple of people .. was down for a couple of hours ..
I'm having the same problem around dc. Change dns to use google: 8.8.8.8 or 8.8.8.4 . Problem solved.
So switch to a different DNS server and see if it works.
yes I have the same problem here in Cambridge
I can use skype but I cannot go on the web. Strange
same here, setup 8.8.8.8 and 8.8.4.4 as default on my router and its allset