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Portforwarding the Mac OS X Firewall

  1. Open Transmission, go to Preferences >> Network and enter a number for the port. It is recommended you pick a random number between 49152 and 65535. Let's use 50001 for now. Then quit Transmission.
  2. Open System Prefs >> Sharing >> Firewall. Click "New." In the "Port Name" pop-up menu, select Other, and fill in the settings as follows:
    • TCP Port Number(s): the port you chose in step 1 - eg 50001.
    • UDP Port Number(s): the port you chose in step 1 - eg 50001.
    • Description: Transmission
  3. Click OK.

    4. NB: To disable the firewall, click Stop.

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