Please copy and paste this in other forums to help other users.
So got my Samsung S3 last week, connected to my home Wifi no problems, I have my iMac and PS3 all connected to it.
Two days ago connection lost: Authentication Error Occurred.
The password was correct and I tried restarted and reinstalling everything (Boring and Long)
I tried the *#0011# and set the power save to off - Did Not Work
So for me the easiest solution with no need to change any settings.
GO ONLINE AND ENTRY YOUR MODEM ROUTER LOGIN (MINE IS ARRIS -
http://192.168.0.1/)
SCROLL DOWN OR FIND: WPS SETTINGS
ON YOUR SAMSUNG CELL PHONE IN THE WI-FI SETTINGS HIT THE LEFT BUTTON AND SELECT: WPS PIN ENTRY
IT WILL GENERATE A PIN NUMBER
ON YOUR ROUTER SETTINGS SELECT ENCRYPTION MODE AND CHANGE FROM PBC TO PIN CODE
THEN ENTER IN ENROLLEE PIN CODE THE PIN GENERATED FROM YOUR SAMSUNG PHONE
PROBLEM SOLVED IT SHOULD CONNECT TO YOUR WIFI AUTOMATICALLY NOW.
YOU CAN LOG OFF THE ROUTER SETTINGS AND YOUR PHONE WIFI SHOULD BE CONNECTED.
I will update if i loose connection again but for now this worked, quick and easy and no changes made just connected via pin code entry