Comcast problems?

Anyone know what's going on with Comcast? From my house, I can reach a few sites with TCP (fortunately, that includes my office, so I could set up a web and email proxy). If I use traceroute, I can get more or less anywhere. If I use a UDP-based traceroute, I can get responses back from the first 8 hops. If I use a TCP-based traceroute, I get nowhere. The fact that I get different behavior for different protocols makes me suspect they're having trouble with equipment designed to control p2p traffic. Their help phone line simply speaks of an outage. Service has come back occasionally, but not for long. The problem has been going on since about 6am. Does anyone have any data? --Steve Bellovin, http://www.cs.columbia.edu/~smb