Jan 16, 2012 Hi, I am using 10.7.2 and Little snitch running. I just had to uncheck 'Block all incoming connections' in the firewall and added the Omnifocus app to bypass the firewall so I can sync my to do list with my iPhone 4s. Does unchecking 'Block all incoming connections' still do the block all. Jul 31, 2017 Here you should find the reply to your question: OS X El Capitan: Prevent unwanted connections by using a firewall: To specify additional security settings, click Firewall Options and do any of the following: Allow only specified apps and services to connect: Click the Add button, then select the app or service in the dialog that appears. What you are referring to as 'the built-in' firewall is actually the built-in Application Firewall. There two other built-in firewalls in OS X Lion, pf and ipfw (the latter is being replaced by pf, but still exist in Mountain Lion). These can handle both incoming and outgoing connections and are typically controlled through command line scripts and settings. Sep 11, 2017 TCPblock is a mac utility app that allows to block certain apps to access the Internet. Tripmode is another app with better and easier interface to block apps from accessing Internet. TCPblock works on system level thus enables to pirated apps work without checking licences as the the app is restricted to use Internet.

Block Outgoing Firewall Connections
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OS X v10.5.1 and later include an application firewall you can use to control connections on a per-application basis (rather than a per-port basis). This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.

Configuring the application firewall in OS X v10.6 and later

Use these steps to enable the application firewall:

Choose System Preferences from the Apple menu.
Click Security or Security & Privacy.
Click the Firewall tab.
Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.
Click 'Turn On Firewall' or 'Start' to enable the firewall.
Click Advanced to customize the firewall configuration.

Configuring the Application Firewall in Mac OS X v10.5

Make sure you have updated to Mac OS X v10.5.1 or later. Then, use these steps to enable the application firewall:

Choose System Preferences from the Apple menu.
Click Security.
Click the Firewall tab.
Choose what mode you would like the firewall to use.

Advanced settings

Block all incoming connections

Block Outgoing Firewall Connections

Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections. The system services that are still allowed to receive incoming connections are:

configd, which implements DHCP and other network configuration services
mDNSResponder, which implements Bonjour
racoon, which implements IPSec

To use sharing services, make sure 'Block all incoming connections' is deselected.

Allowing specific applications

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To allow a specific app to receive incoming connections, add it using Firewall Options:

Open System Preferences.
Click the Security or Security & Privacy icon.
Select the Firewall tab.
Click the lock icon in the preference pane, then enter an administrator name and password.
Click the Firewall Options button
Click the Add Application (+) button.
Select the app you want to allow incoming connection privileges for.
Click Add.
Click OK.

You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.

Automatically allow signed software to receive incoming connections

Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.

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If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app.

If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.

Some apps check their own integrity when they are opened without using code signing. If the firewall recognizes such an app it doesn't sign it. Instead, it the 'Allow or Deny' dialog appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.

Enable stealth mode

Enabling stealth mode prevents the computer from responding to probing requests. The computer still answers incoming requests for authorized apps. Unexpected requests, such as ICMP (ping) are ignored.

Firewall limitations

The application firewall is designed to work with Internet protocols most commonly used by applications – TCP and UDP. Firewall settings do not affect AppleTalk connections. The firewall may be set to block incoming ICMP 'pings' by enabling Stealth Mode in Advanced Settings. Earlier ipfw technology is still accessible from the command line (in Terminal) and the application firewall does not overrule any rules set using ipfw. If ipfw blocks an incoming packet, the application firewall does not process it.