hmm, you sure there isn't any software firewall running?
Also, I made the mistake of having had two local IP addresses get the same ports forwarded.
I had 23073 open to 192.168.0.102 and 23073 open to 192.168.0.105 - it never worked for me or anyone else.
Check to make sure this isnt' the case for you.
If you're trying to join your own dedicated server, I would suggest you have your dedicated server downloaded into a different folder (
Download Here)
Also, try changing the port from 23073 to something else - I believe map download is always the normal port + 10 (so 23083 if normal port is 23073)...
- hopefully that helped!