I'm the network admin at work, but I'm not an expert in networking and security, and unfortunately don't count with the latest resources (hardware/software).
My question: someone at work bypassed the firewall by using a remote proxy server, therefore gaining access to blocked sites.
Is there any way I could prevent this as much as posible ?
(apart from blocking tons of known proxy servers - they could always find another one)
I suppose there isn't a fast-easy-miracle solution, but any help will be very appreciated.
Maybe after that I can use my time in more important stuff!!