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@Rscar wrote: ... is Comcast known to block port 80 in the event of data overage?
All I know is that sometimes customers have been able to clear the block by responding to a message in their "My Account" pages. Here's one example: https://forums.xfinity.com/t5/Internet-Archive/DOCSIS-3-1-and-Terabyte-data-cap-upgrade-block-upstre....
As stated, the guessing is that it's a bug in their in-browser notification system, not a deliberate block. But I'm not Comcast, so I have no access to that system, nor any or knowledge of it beyond what I read here in the forums.
The "in-browser notification" bug is not the only possible cause, and may not be the most common one. Only a Comcast rep could say for sure what caused the block in any particular case.
You might try logging in to https://customer.xfinity.com/ to see if you have a usage overage, copyright, or other message there that you need to respond to. A bug in their in-browser notification system can block http (port 80) traffic.
I believe I'm having the same issues as described here: https://forums.xfinity.com/t5/Your-Home-Network/Can-only-browse-HTTPS-SSL-sites-Google-Facebook-not/...
Problem: I cannot access some websites from any device, wifi or hardwired to the modem. I've confirmed using portquiz.net that I can talk to port 8080, but not 80.
Wondering if it was a bad modem, I bought a new one, which worked for about a day before falling into the server patterns. I can ping and trace route to the failing sites, but cannot see them in browser.
I've tried disabling all firewalls, changing DNS, flushing DNS, and of course many many modem/router/device reboots.
Any help is greatly appreciated! I was unable send a PM to ComcastJohnN due to parts of the page not populating for whatever reason.
Solved! Go to Solution.