actually depending on the proxy/firewall that is being employed there is a very good change you can bypass it all using TOR network. this is a free open source private proxy system that hides your network traffic. so the filters never see the real source/desitnation
details on the open source version can be found here
Tor: anonymity online
there are of course speed issues since its routing you all over the place, but it still works.
now what i use is this product
http://www.ironkey.com http://www.ironkey.com/demo
part of the product includes a private TOR service, one thats owned and managed by this company reducing MANY of the speed and security issues that come with the public TOR networks.
either way, the TOR will get you past almost any type of we security filter (yes i work in IT too..
)
