IMO, you're going about this the wrong way. If I found you backing through my firewall, and my policies, I'd be pissed. The only engineering you should be doing at this point is *social* engineering.

Have you tried *asking* the folks who control the firewall if they can open babelfish for you? You have a good reason, and you're a lot less likely to get your pee-pee slapped if you get caught, so why not try that?

By the way, are you spending working hours trying to do this, or are you doing it on personal time?