Can’t connect to the server

I get the error message and can’t connect to the service. Simply, I can’t use it.
Talked to the customer service, and they seem to have no clue. They tell me to install some security software to use the app, which I think is absurd.

Quite frustrated and disappointed. DaumKakao, you should do better.

FrustratedKatalker about KakaoTalk, v2.0.1