Sony KDL46Z4100 Ethernet Port

I have concern that the port on my new tv is not working. My tv is less than 3 weeks old and so I am still working on learning it. I attempted today to connect my router to the ethernet port and do a software update that is listed on the Sony support site. When I tried to make the connection I got an error that said the connection could not be made. The cable is new. The router is DHCP enabled (vice being static) so it should update automatically. No luck. I even inputed the information manually. No luck. I contacted Sony support via chat only to be sent to the phone to talk to a technician whose solution was for me to buy the Sony internet box they are selling for 200 dollars....spoke to a supervisor who informed me that the software update server is not even working....has anyone had any success in using the ethernet port?