I did have the remote management portion of IPMI working locally and externally but it is now giving me an "Usage: java RConsoleApp <Aster Card IP> <Port>" error message.
This is a Tyan GT20-B7002 barebones server and is running the IPMI firmware version S7002 R4.02
I even opened up EVERY port externally and disabled firewalls.
Edit: Sep. 14, 2011 Sent Tyan technical support an email. I will update this when I hear back from them.