I connected my modem directly into my laptop using an ethernet cable to remove the router and vonage from the network. What happened was that my browsers worked for 2 minutes and then they stopped working. I would call Comcast technical support to troubleshoot. I called them at least 10 times and they would reset the modem. After they reset the modem the internet browsers would be up for about 2 minutes and then go down again before it stopped working.
I went to Comcast to replace the modem, and after I set it up it still didn't work, but after an hour I reset the modem again and the internet browsers were working once more for about a week.
A week later (today), the internet browsers went down again. I tried everything. Comcast technicians says there's nothing wrong and it's a computer issue but I refuse to believe that. How could 5 PC's, iPad, Wii, and iPhone internet browsers all refuse to work at the same time? I tried using different coaxial cables and different ethernet cables but nothing works.
I couldn't find a single other topic related to this issue, browsers don't work on any device that utilizes the network but other programs do such as video games (warcraft 3), Wii Shop Channel, Aol Instant Messenger, and Microsoft Outlook.
My deduction believes that there is some internal configuration in the modem that prevents access to web browsers. But I honestly don't know how modem works.
I would switch to a different ISP but there are no other ones that are as fast as Comcast. DSL is far too slow and there isn't fiber optics in my neighborhood.