Why is Netflix not working on SmartTV?

After I tried to log in (email and password) was after each further attempt only something like "connection with Netflix not possible, please try again." (Internet connection available, no software updates on Smarthub available, Netflix still looks quite old) Had someone probably. The same or a similar problem and could help me?

Is this different with the PC?

Then make mistakes with your television model in an Internet search, I had with our SAMSUNG and found a solution there.