I just removed the McAfee program and NOW I get internet connection. What's the deal, McAfee???????
This Comcast's version of Mcafee or a paid subscription?
What is the version of security centre and the current shown dat version?
Did you ever have another AV installed like AVG or Norton?
Run MVT and see what it says
Mcafee Virtual Technician is found on the Technical support page in Useful links tab above. Run it and note session number.
If no go try setting the firewall to defaults and if that fails uninstall Mcafee reboot and run
Reinstall it from your account
To uninstall follow the steps here
If all above fails contact Tech support for your country calls are free and chat is as well.