Agreed. Same problem with Windows Update since yesterday; Comcast DNS servers do not succeed in reaching Windows Update. I also changed to Google Public DNS servers, and the WU connection succeeded within 5 seconds, and continues to work as of about 5 minutes ago.
It's also worth noting, though, that before trying Google Public DNS, I tried another set of free DNS servers (Cloudflare), and they couldn't connect to WU either. So while Comcast is definitely affected by this problem, it seems it's not entirely Comcast's fault. I think it will take Comcast working on this, with or without collaboration with MS, to get this sorted out.
Best of luck on this to everyone!
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