Mac firewall block application outgoing
If you use a Mac, chances are you might not even realize that OS X comes with a firewall. It only blocks incoming connections. Before you can make any changes, you need to click the lock icon in the lower-left corner and then enter you admin password. There is an option to automatically allow signed software to receive incoming connections.
This means that apps and services signed by a valid certificate authority will automatically added to this list.
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Any app that created by Apple, for example, that needs to receive incoming connections will be automatically added to the list. Stealth mode simply means that your computer will be effectively invisible to probing requests to reveal your existence on a network.
OS X: About the application firewall
Your Mac will still answer requests from authorized apps. Just turn it on and forget about it.
Still, unless you have a security concern about a particular application on your computer, the firewall on your router is more than adequate to block intruders from finding you. Like the original release, Radio Silence 2 selectively blocks outgoing connections by adding selected applications to a blacklist. This is now done from the Firewall tab, and once added, the blockade takes effect immediately. However, a toggle switch in the bottom right corner allows users to temporarily turn off the firewall on a global basis.
Common processes that maintain a connection between iTunes and your iOS devices can rack up thousands of outgoing pings in a short space of time, but Radio Silence 2 provides real-time feedback. Some of this information may seem startling at first; processes like usbmuxd, which handles communication between iTunes and iOS devices, initiate thousands of outgoing connections in a relatively short amount of time, for example.
Fear not, this is normal behavior. Active processes are displayed as a number in Network Monitor, and clicking one shows the time, host, and port being used for each connection in the list.
To silence the host application or process, simply click the Block button to add it to the blacklist. For less than 10 bucks, Radio Silence 2 is an indispensable Mac utility to monitor outgoing network activity and selectively block applications from phoning home to the mothership. Get the Apple Watch Series 3 at Walmart for the lowest prices ever.