I've just booted up my old computer that hasn't seen the internet in a year.
When I last used it trainer authentication was fine.
The old computer, even after the latest boot up, has performed no AV or firewall updates.
Now however, it has the same trainer authentication problem.
I've already disable my router and modem firewalls.
Could Comcast be blocking outgoing port 80 for anything other than web browsers?
I know you probably still don't have any suggestions, but I'll keep updating this thread as I discover more about this issue.
Xalek,
I have Comcast as well and have not had this issue, however, since you have also used an older computer to test the very same thing then it has to be some kind of ISP issue, I wonder if somehow they have blocked the CH authentication server/service from returning any information or just plain blocking it altogether.
I'm going to assume it is *not* the same server as the Website but of course there maybe no way to tell without contacting Comcast for assistance.
Maybe they can confirm if there is no return packets coming from the authentication server or simply any packets being sent to that server are being dropped.