Wifi Access Restrictions

Hello,

I use the wifi at a location that requires daily registration. The system then immediately gives you a password and a user name. The problem is that internet access is only limited to 1:30 (all at once) per 24h, I can't download voice messages, watch youtube, use skype, etc.

For a few months I realized that if I don't close off Firefox and restore the session, I could use the wifi without registering and without any restrictions. Now they have changed something and I get

XML Parsing Error: no element found
Location: http://www.google.com/
Line Number 1, Column 1:

Which, when reloaded, switches to the registration page. Even when I repair the connection to change the IP it doesn't work.

I'm only studying here for a few months so I can't get internet service at my apartment (requires 1 year contract). Does anybody know a way around the restrictions?

PLEASE HELP.

BTW: The location and the bandwidth are 100% government subsidized so watching a YouTube video is not going to hurt anybody.