Why does my Kindle say connected to WiFi but no internet?

Why does my Kindle say connected to WiFi but no internet? 

In that case, your Kindle Fire tablet will still show that you are connected to the WiFi network, but it won’t use the internet. This is because you didn’t reconnect to the WiFi network with the new password. If that is the case, you can forget the WiFi network and reconnect with the new WiFi password.