If the address is ff:ff:ff:ff etc, then you have a warranty issue.
If you are getting this message from netflix, and have a valid address (they set your subscription based on that address) then it's another netflix fail.
I am trying to set up my TV onto my network via LAN and I am receiving a MAC Address Invalid error during test. I have tried both Auto and Manula Setup with no luck. I have connected my laptop up with the same cable and connector and the connection is working. SAMSUNG support had me set the TV back to the factory defaults with no luck. Has anyone had this issue with this series TV? I am using a Cisco E3000 router and a Linksys switch; all other connections and components are working.