I am having the same issue. I set up a relative's laptop using an xfinity wifi hotspot connection to see how well the hotspots work, with the intention of removing the connection when I delivered the laptop. Big time-consuming mistake. A Comcast customer service rep went above and beyond trying to help me get rid of the connection, but from what I gathered from her back and forth with an unseen tech, the laptop's MAC address is PERMANENTLY bound to xfinity wifi - once you log on you are registered forever!!!! I'm old enough to remember when Microsoft called silliness like this a '"benefit," and no doubt that's what Comcast will say. BTW, I tried the obvious fixes - I changed my password, disabled and reenabled the wifi card, and cleared cookies. But like a bad penny the connection keeps coming back. Disabling the wi-fi card is a good solution until an enterprising user turns it back on. There are serious security and privacy issues here, not to mention non-Comcast customers using bandwidth Comcast customers are paying for. I don't want anyone else, including people visiting my relative, using a hotspot with my username and old password. I don't want to think about the potential horrors - stolen usernames and passwords come to mind - awaiting an inexperienced user on unsecured wifi, nor do I want to worry about them getting into mischief - on purpose or inadvertent - that leads back to me. Comcast does not not warn users of the immortality of their xfinity wifi registrations. That is inexcusable. Comcast needs to provide a way to unbind the MAC address of a Windows computer from xfinity wifi. Can we get an answer from an admin please? ADDENDUM: While we are at it, AVG reported a second adapter with MAC 00-00-00-02-02-02 on the network. I am not a Unix tech, but Google says this is an indication of a second MAC address on a a single physical interface - presumably two MAC addresses associated with my one NIC. Is Comcast aware of this, or is someone piggybacking onto my connection?
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