If you've changed your network card or installed a router, they will deny you access to the Internet. First it will authenticate the Cable Modem, and then when your computer attempts to get online, they'll check and make sure that you're still using the same computer/network card/etc that you've always used. Some cable companies, for some reason, also authenticate the network card in your computer. HFC (Cable Modem) and NIC (Network Card) MAC authentication: When your modem boots up, it attempts to talk to your cable provider, and the provider will either grant or deny it access based on it's MAC. Every DOCSIS cable modem has a unique one. Most cable companies authorize your cable modem based on it's MAC address.
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