Why won't my Galaxy S4 accept my wifi password?

[AC Question]

Why won't my galaxy 4 accept my wifi password

After 2 years my android galaxy suddenly wants a password for wifi but won't accept it. It's been working fine all this time. Then our android tablet was fine and something synced and now the tablet asked for a password and won't accept it.

 

[B. Diddy]

Re: Why won't my galaxy 4 accept my wifi password

Welcome to Android Central! Is this on your home wi-fi? Or are you using someone else's wi-fi? If it's your own wi-fi network, you should be able to modify the security by logging into the router's settings using your computer browser.