it's probably more a BES related question, but I've set up Z 6.0.9 and BESx 5.0.2, connector 6.5.5, OLK 2007 SP2 on W2k3.
Everything seems to work great. I tested the BES connector by sending an email with outlook and works. I've added a BB user fetching infos from Z, so the connection between the two seems working!
I checked connection between BESx and RIM's server and the test went fine.

But then, when I try to activate a mobile against the email address I've configured, it fails saying network connection not available.

I've connected the BB device via Wifi, and enabled wifi activation on besx.

On the firewall, I've forwarded 3443 from outside to the BESx server. Does it need anything else?