Some customers are having issues with their XFINITY Internet service. We apologize & appreciate your patience while we work to fix.
— ComcastCares (@comcastcares) November 6, 2017
For a few hours this morning some websites were accessible while others were not which may be symptomatic of an Internet backbone problem but as of 11:45am, nothing of the sort had been identified as the cause. It was also not confirmed whether the outage impacted just Comcast customers or other services as well.
Service appeared to be restored around 11:25am