"Olivier Sarrat" <olivier_sarrat@hotmail.com> writes:

> Thanks Eric for your fast answer, but I knew already about that system
> properties stuff... You can only set the hostname and port of the
> proxy server through them, but you can't set the login/password.
>
> So, the question is still open !

Why don't you just use a SSH tunnel or netcat proxy to tunnel through
the firewall?