Can anyone tell me what ports the game uses for multiplayer or where I could get that information? Thanks in advance!

-Viper118:bdroid1:

The specific UDP ports that Jedi Outcast uses are 28060, 28061, 28062, and 28070 through 28081 (inclusive.) These ports need to be opened in the Out-bound direction to join games. They will also need to be opened in the In-bound direction if you want players outside of your firewall to be able to join your dedicated or non-dedicated servers behind your firewall. Please consult your router manufacturer’s manual for information on how to set these ports.
From the Troubleshooting text on the main menu.