I just thought I would post this solution here after I spent several days and hours on the phone trying to get my Samsung Smart TV to connect to the internet. After having the television for 2 years with not problems at all, suddenly it would not connect to WiFi. The last tech at Samsung that I spoke with knew exactly what to do and my TV was back working and connection to the internet within a few minutes. He told me to reset the DNS to 8888.
Detailed instructions for the computer challenged community such as me:
On your TV remote, go to Menu, Settings, Network
Next select Network Settings, Start, IP Settings
Then select DNS mode and make sure the green check is on "manual"
Enter 8 8 8 8 and OK
Bingo, instant internet
(note - I also was told to click on Samsung Smart Hub in upper right corner. I had reset my TV and it needed to update and add back my programs)
I have a Samsung Smart TV Model No. UN553S6500 (a 2012 model)
NOTE: I adore people that know their jobs!♥ Thanks Chris!