I am not streaming from my house, and I know Comcast is not the ISP here. That is what I assume you mean by Comcast internet.
I get the error when attempting to stream TV; I haven't tried movies, nor have I checked all 50 streams. SyFy, HGTV, E!, NBC Sports, BBC World News, CNBC, FOX News, A&E are not working...ESPN2 and Disney are. Does that help?