samsung note 2 androind version 4.1.2 cannot connect to wifi and authentification error occured

[Android Central Question]

I'm using samsung note 2 GT-N7100 android 4.1.2, the phone connection to wifi cannot be used since 12/11/2017. Even though the correct password had been keyed in , it is still show authentification error occurred. Pls assist on urgent basis as i'm fully count on wifi support

 

[B. Diddy]

Welcome to Android Central! Have you already tried forgetting the network and reconnecting? Also, try rebooting the router by unplugging its power for 10 seconds.