What is the error you get when you try to connect to the wifi ?
have you set your dns searches on your wifi device to be primary 184.108.40.206 and secondary 220.127.116.11?
Thanks for the response,In my tv I have only one option for enter DNS server .There is no primary and secondary options.
already tried 18.104.22.168 but it doesn't make any difference. After the search for wifi there's no error message just came back to the previous menu.For getting correct DNS address to whom I need to approach?ISP or Samsung? I get Lan internet in that case I choose automatic and its work fine.Why it is not working in wifi?