Just to add some to this:
https : // endian. zendesk.com / entries / 20061226-dnat-port-forward-basic-setup
I thought I would better explain my network setup: See attached image
Ubuntu 10.10 Dell Cert Edition
VirtualBox Installed on Headless System
WAN 64.X.X.130 -> DELL PE 2900 Server 10.X.X.22 ->
2 VM's
1. Windows 2003 (DC)
2. Endian FW (2.5.1)
Green Interface 10.x.x.1
Red Interface 64.X.X.130
What I did dicsover is I can reach the RDP of the windows DC through a port forward rule.
I just can't reach the host machine the Dell PE 2900
I think I may have figured out the issue, I am going to test my theory. Will let you know.