Question about OS X's firewall and uTorrent

Discussion in 'macOS' started by 0dev, Sep 7, 2012.

  1. 0dev macrumors 68040

    0dev

    Joined:
    Dec 22, 2009
    Location:
    127.0.0.1
    #1
    I'm just curious here. I'm running Lion and I set up the OS X firewall to block all incoming connections, yet when I run uTorrent it seeds fine, which is awesome but I thought I'd have to set up the firewall to allow uTorrent to accept incoming connections. So does that work when the firewall should be blocking it? And does it mean other things can get through the firewall or not?
     
  2. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    There may be a firewall exception for that application or the app uses a standard port for transmission, i.e., port 80 which will not be blocked
     
  3. 0dev thread starter macrumors 68040

    0dev

    Joined:
    Dec 22, 2009
    Location:
    127.0.0.1
    #3
    I never set up an exception. It could have been using a standard port though. I was using magnet links and the communication was through DHT.
     
  4. Beta Particle macrumors 6502a

    Joined:
    Jun 25, 2012
    #4
    Seeding is outgoing traffic, isn’t it?

    Get Little Snitch if you want full control over what is happening on your Mac.
     
  5. 0dev thread starter macrumors 68040

    0dev

    Joined:
    Dec 22, 2009
    Location:
    127.0.0.1
    #5
    I thought it was incoming traffic since you usually have to change the firewall settings.

    I do have Little Snitch :)
     
  6. Zerozal macrumors 6502

    Joined:
    Apr 3, 2009
    Location:
    PA
    #6
    uTorrent supports automatic port mapping with either NAT-PMP or UPnP, assuming your router also supports one of those protocols (most modern routers support at least UPnP).

    Since uTorrent is working for you, you probably already have this option selected. To verify, go to uTorrent Preferences-->Network and you'll see that the option "Automatically map port" is checked.

    No muss, no fuss. Wikipedia has good articles on NAT-PMP and UPnP if you want to read more about how they work.
     
  7. 0dev thread starter macrumors 68040

    0dev

    Joined:
    Dec 22, 2009
    Location:
    127.0.0.1
    #7
    Awesome, thanks for the info.
     

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