Hey, thanks for the info! Everything seems to be working fine now...

In case anyone is interested, here's the rundown:

Open Network Properties, right click on Local Area Connection, and select Properties.
Click on the Advanced tab, hit the Settings button. ("Internet Connection Firewall" should be checked)
On the Services tab, click on the Add button.
Enter a name for the service. (I called mine "Empeg")
Enter the IP address of the player, and enter ports 8300 & 8301.
Click OK, and Emplode should now work fine.