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Students bypassing filtering

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Students bypassing filtering

cporter
I work for a large school district. We have a problem with students and teachers byapssing our filtering system (websense). They are simply entering in a proxy server into the browser and it's past the firewall etc. The machines in question are personal laptops and old win9x machines so the group policy isnt an option. We do not have any kind of network registration system in place either. Does anyone know how to prevent this? We are running a PIX firewall version 7. Any help would be greatly appreciated.

Chris