all is ok but after i press check in button (normally i got redirected to public ip adress and have acess to internet), i got redirected to the private ip adress of the instance instead of the public ip and not given access to internet. 

Not sure about this problem. You mean the wireless devices can pop up the facebook authentication page, but after you have clicked "check in", it will redirect to a privete page and you can't pass the authentication? Did it have some error information?