My Samsung galaxy note 2 is telling me authentication occur fail when I want to connect to wifi

That means you are using the wrong password for the WiFi you are trying to connect to. You need to verify the password you have for it, and I would suggest turning on the ability to see what you are typing when you enter it to make sure you don't make a typo. Any caps, symbols, etc., must also be put in correctly with the password.
 
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