I don't know what the error code means, but http://forums.comcast.com/t5/XfinityTV-Website/XfinityTV-Online-Help-FAQ/m-p/1106967#Can-I-watch-videos-online-if-I-am-outside-the-USA? says:
Unfortunately, we do not have the rights to stream content internationally. If you are physically located outside of the United States, you will be unable to watch videos on our site.