how to remove authentication problem

[yas2]

i connected the wifi network but my android phone getting authentication problem and my phone new one....

 

[popatim]

Which cellphone do you have?

 

[hang-the-9]

Exaclty what is the problem? Did you maybe just enter the wrong password to the WiFi network? Try rebooting the router, if the password is correct, it may just be a router wifi issue.