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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)
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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 127.0.0.1 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.

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