First technique tested: TOR
Because there is no Firefox extension with TOR support built in, the division installed the TOR package first, which includes a TOR based HTTP proxy: Privoxy.
The only thing man needs then is to configure the network settings in Firefox to 127.0.0.1:8118 - that's it.
Why installing an additional extension like Torbutton or FoxyProxy? (btw: Tor-Proxy.NET forwards all traffic to 1 private server and later to TOR... (al least they claim so))
So, does TOR help to bypass a HTTP proxy (in our test): nope.
The division does not have an insane "outbound allow all"-packetfilter rule on its firewall config, and that makes it very hard for the local tor-daemon to get a connect to his network. Configuring port 80 and activate "My firewal only lets me connect to certain ports" does not help, because the HTTP proxy of the UTM device does what it should do: filter out non-HTTP traffic.
Last chance: activate "My ISP blocks connections to the TOR network" and configure a TOR-bridge.
So, how should that work without "outbound allow all"...
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