One of the most annoying things that Comcast has done is to turn all their customers into unwitting public hotspots. Not to mention the potential security problems, this creates a new entry point to your network. They have buried it under three layers of menus, but you can turn it off:
- Goto comcast.net and log in.
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Click on Users and Preferences
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Manage Xfinity Wifi
While you are there, you might also want to uncheck the “allow comcast to call you on your phone with ads” option as well.