No connection through wireless router

Cant connect to the internet through wifi

I am trying to configure my own wireless in my dormitory room but whenever I plug out the cable connecting my laptop and the router, the network gets disconnected, its like my wireless is not working and I can not get to the authentication server to log in my username and pass to use the dorm's internet. I already traced my packets but it seems that they get lost after the go through my router.. I changed almost all the wireless setting of my router but still if I wanna have internet I have to connect my laptop with a cable to my router (of course the router is already connected to the internet itself with cable) I am sure the problem is in my configuration since there are some people that they have their own Wifi and my router works perfectly in a normal internet network (without an authentication server). any idea what is happening? and what should I do?
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