Done.
Finally I think I managed to get the 3 proxies right.
And I'm already going out through the new outgoing path.
I had this already working but then, making changes on the proxies configurations, I rendered it unoperational for HTTP.... :-((
So, I think I understand finaly what I did wrong and, thus, let's see if it is ready for final commit next week when the new access link to the Internet is installed....
