I have a Samsung Galaxy Stellar from Verizon. It's unrooted.
I can connect to a Wi-Fi network (input the network security key, etc). However, I can't use the network. I've tried it over three different networks and none of them worked. I've also done a factory reset still it doesn't work.
It worked just fine until a few days ago.
This is my wifi screen:
And this is my notification bar, where it says it's connected: