Same issue here. Try updating the firmware, but don't trust your tv if it tells you the firmware is already up-to-date. In that case use a usb stick and update manually. Worked for me.
NetFlix Error UI-800-2 is the most common error on smart TV. If you also one of the victim of this erorr kindly follow the steps mentioned below :
Restart Your Wi-Fi
Restart Setup Box Or Streaming Media Player
Sign out – Sign In Netflix
For Full Article Please Visit : How To Fix Netflix Error UI-800-2
I couldn't believe it and thought you were making a a joke about a Konami code.
It worked!! It brings up the configuration page and let's you hot "reset" or something. Thank you so much.
I tried the re-install which didnt work either , and you cant delete the netflix app to fully re-install it as it is part of the default software. My guess is the re-install just does the app, but doesnt clear out the broken settings that stops it from connecting. You can trick the TV into deleting Netflix however by pressing the FFWD button, then 289 , then the REWIND button and the hidden county menu appears. Select SYRIA (which doesnt allow netflix) and it will be deleted (also other apps will get cleared like iPlayer, Amazon etc , so you may need to reenter some passwords eventually) , go through accepting the T&C's and its then removed. Now do the same again and select your actual country and Netflix and all the other default apps for your country are properly re-installed. You can now get past the "not able to connect" screen and login.