Python App Mac Firewall

You can allow incoming connections for python in System Preferences-Security & Privacy. Click on the Firewall tab and then the Firewall Options button (you may need to authenticate/unlock first). You should see python listed somewhere and you can select to allow incoming connections. This solved the problem for me at least.

09 Nov 2016

Recently I found out that PyCharm fromJetBrains, despite being a wonderful IDE forPython, is continuously broadcasting my username to 230.230.230.230 forlicense check, seeherefor a report of the same problem for another Jetbrains’ product, which has thesame underpinning IDE as PyCharm.

Naturally, I want a firewall to block the outgoing traffic to avoid leaking myprivate information to any network I might connect to.

Firewall

The OS X application firewall (see Applenotes) can block incoming traffic onper-application basis and prevent applications from listening on network ports,but unfortunately it cannot be configured to block outgoing traffic.

The application firewall, however, is indeed implemented with PacketFilter fromOpenBSD project. Remember Mac OS X is part of theBSD family? PF has been shipped with recent releases of Mac OS X since Lion,including macOS since Sierra.

Firewall Apps List

There are a number of third-party applications/firewalls on the market such asmurus. But they basically provide the user aGUI to configure PF on macOS - of course sometimes with other useful featuresas well - and they are mostly paid application (although murus does have alite version that is free).

But if you’re comfortable with command line as I am, all GUI applications areoverkill for the problem in hand. It’s possible to configure PF to blockoutgoing traffic in several easy step and less than a few minutes!

Python App Mac Firewall Download

Python App Mac Firewall

  1. First, create a new anchor file named /etc/pf.anchors/jetbrains with thefollowing PF rule to block traffic on interface en0 for any traffic sent toIP multicast address 230.230.230.230:

    You would need sudo privillege to create file under /etc/pf.anchors. Ananchor file is used to hold a sub-ruleset, which we will attach to the main PFruleset in the next step. quick asks PF to stop further processing should apacket matches the rule. See PF filter reference on the syntax of therules for more details.

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  2. Then add the jetbrains anchor to the default PF configuration file/etc/pf.conf. This allows the anchor and the rules to be active whenever youactivate the macOS firewall without interfering with any application firewallrule you might have defined through GUI.

  3. Last, start the firewall from System Preferences→Security & Privacy→Firewall.

Python App Mac Firewall Software

Tested with the following software versions:

  • macOS 10.12 (16A323)

Other useful resource for PF on macOS:

  • This article is mostly still relevant for macOS Sierra, although I believethere is no need to create a launchd item should you put the anchor into thedefault pf configuration file /etc/pf.conf as shown here.

  • This is a detailed wiki about PF and its command line pfctl and pflogetc. Good read if you’d like to see more example usages of these tools.

  • This is a great guide with discussion of security and privacy on macOS to abroad extent. It also touches packet filter and discusses options forthird-party firewalls (including options that may not use PF).

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