Why I Can't Use Wifi for anything except whatsapp? I can't use WiFi for anything except WhatsApp on my Samsung Galaxy S3 mini.

I already turned on WiFi on my phone. But I can't do anything except WhatsApp. I can't browsing via WiFi, and can't open Play Store either. But when I use mobile data (via my Internet provider) I can do anything, except that I can't browse Play Store either.

When I use WiFi via my computer it can work, but can't work again via my phone.

The password is correct. I already check it, but nothing's work.

What should I do? Please help me!
Had exactly the same issue. Fixed it:

Set the router to automatically assign DNS.
Turn off PC, Router, Android.
Turn on PC, Router, Android after 15 sec.

Everything works like before now! :)