Skip navigation

How do I open up a specific port in the Application Level Firewall?

1545 Views 10 Replies Latest reply: Jun 20, 2013 6:03 AM by Gerben Wierda RSS
Gerben Wierda Level 1 Level 1 (125 points)
Currently Being Moderated
May 3, 2013 5:46 AM

Currently, my system blocks port 2336 and I want to open this up. To be precise: port 2336 is listening on the local system, both on and its 192.168.x.x address, but no client on the LAN can connect to port 2336.


IPFW and PF are not running. When I turn ALF off in System Preferences, I can connect to port 2336 from a LAN client. So ALF is blocking port 2336. How can I open this up?

  • Linc Davis Level 10 Level 10 (107,375 points)

    ALF is not a packet filter. It blocks executables, not ports. Add the executable to the whitelist.

  • Linc Davis Level 10 Level 10 (107,375 points)

    The adaptive firewall in OS X Server is not the same as the application firewall. I don't know how they're related internally, but the configuration of one has no effect on the other.


    You probably don't need the application firewall at all. It's useful when you have a portable computer that sometimes connects to a trusted network, where you want to provide services, and sometimes to untrusted networks, where you don't. Instead of turning the services on and off every time you change networks, you turn the firewall on and off.


    Another scenario in which the application firewall might be used is when you're providing Bonjour services on dynamic ports, and for security reasons you want to make sure that the processes listening on those ports are the right ones.


    If "appleugcontrol" is codesigned, then check the box to allow all signed software to receive connections. If not, you should be prompted to allow or deny connections when it tries to bind a port. The setting will be saved.


More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.