Need teamspeak server help!

I set up a teamspeak server on one of my home computers, but when i try to connect from my external IP i it keeps saying "your connection to the server has been terminated" The router port 8767 is open to that computer, yet it still doesnt work! The only way for it to work is if you connect internally (if i connect to the computer inside my network) The acutal error at the bottom says "Connection timed out"

Help?!?!
_X_X_X_X_X_[small]Asus P4P800
Intel Pentium 4 2.4C (OC'ed to 3GHZ [250FSB])
512 GB (2x256) Corsair XMS DDR PC3200 (DDR 400) (Dual Channel config of course...)
[crappy HDD]
ATI Radeon 9600
TDK 420N DVD+R(W) BURNER[/small]