Info 2 [Q] connecting to WiFi with only wps button it possible?

hi I am using Samsung galaxy s duos gt-s7562.I recently tried connected to a WiFi whose password is not known to me.router was easily accessible and wps button was available..I checked "show advanced options" on my phone and selected wps button as a way of authentication.then a screen popped up showing press wps button on router within 2 minutes.I did so and was connected to that router.status appears as connected.signal strength is very high but still I'm not able to open any page on my randomly sends some bytes n no page opens up.
what is the reason for this?? is password also required for connection or only wps button is sufficient?? please help....!!