Samsung UN40D6420UFXZA - Manual (Page 112)

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If Your TV Fails to Connect to the Internet
Your TV may not be able to connect to the Internet because your ISP has permanently reg-
istered the MAC address (a unique identifying number) of your PC or modem, which it then
authenticates each time you connect to the Internet as a way of preventing unauthorized
access. As your TV has a different MAC address, your ISP can not authenticate its MAC ad-
dress, and your TV can not connect.
To resolve this problem, ask your ISP about the procedures required to connect devices
other than a PC (such as your TV) to the Internet.
If your Internet service provider requires an ID or password to connect to the Internet, your
TV may not be able to connect to the Internet. If this is the case, you must enter your ID or
password when connecting to the Internet.
The internet connection may fail because of a firewall problem. If this is the case, contact
your Internet service provider.
If you cannot connect to the Internet even after you have followed the procedures of your
Internet service provider, please contact Samsung Electronics at 1-800-SAMSUNG.