My mobile show connected with wifi router but cant open internet browser on mobi

If you haven't entered the network password then you are not connected , your phone is only showing that it see's the signal. To connect to the internet through your router and network you have to enter in the network password.

I have entered the password but even then it did not worked  

I purchased a TP-Link router, router is working fine with the Laptop but not for my Sony Xperia Sola When i turn on the wifi on my phone and connect to the wireless network in range, it says connected with excellent strength. but i am unable to access internet or open any website in my browser 'It say Loading Loading.... and then Retry'.

Before this I used WIFI on this mobile and it worked fine,

I tried everything I could, used reset button of router, switched on/off my router & my phone but nothing worked.

Please someone can guide me, what's the solution of the problem?