I hope this might help some users, I assume the information is correct
I spoke with Comcast and while waiting, they had a recorded message that basicly said if you use Comcast Cable internet, and use Windows XP, that they suggested using Microsoft IE6 or IE7 as it will work, if you use any other Web brower, such as Firefox, Mozzila ect, they will not assure full funtionality. They reccomended use IE6 or IE7 only, so if you are using Comcast for your ISP and are using a different brower other then Windows Internet Explorer 6 or 7, this may be a reason for your connectitivty problems in genenral
As i said, i have not tested this theory, just passing on the info i got
Hope this helps