I'm business class customer in Michigan, and it seems more like my DNS traffic is being blocked. I use OpenDNS normally, and I cannot reach it, Google DNS, or DNS for Michigan State University, so it seems like more then just Comcast DNS is not available, at least to me.
Here is some info from a support chat. I am hoping that the rep is incorrect that this is "This is a system maintenance to further improve our service"
Gillyn(Sun Dec 5 22:54:43 CST 2010)>Thank you for waiting. I am so sorry but upon checking, we currently have system maintenance on your area. Our network engineers are working to resolve the issue as we speak. What I can do now is to reset the modem and hopefully it will work, if not, you will need to wait a few hours for the maintenance to be finished. I assure you that this will be resolved as soon as possible. We have created the following customer service ticket: ###########. Please refer to this number should you contact us regarding this issue. We are prioritizing this issue since we understand how important your service is. I can assure you that there is nothing wrong with your account. We appreciate if you would bear with us on this. You will be compensated for the inconvenience this is causing you. Thank you so much for your patience and understanding.
Me_(Sun Dec 5 21:55:57 CST 2010)>System Maintenance or System outage?
Gillyn(Sun Dec 5 23:02:57 CST 2010)>This is a system maintenance to further improve our service. Our network engineers are working to resolve the issue in order to restore everything. Rest assured, I have made the necessary notations here in your account. Thank you so much for understanding and bearing with us in this situation.
It is obvious that a few of us network nerds realize what the problem is and have knowledge in our possession as to how to fix it. I feel bad for everyone else in my city that doesn't know what to do and as stated elsewhere, the trouble number is down too. What a sounds like "pitch" for these users.