Little Snitch is a network security and privacy tool. It does the exact opposite thing that a Firewall does; that is, it monitors and blocks outgoing connections from your Mac. When you install Little Snitch, and after a system reboot, every single application that wants to establish a connection to a sever will have to go over Little Snitch first. This app asks you what you would want to do when a new connection is attempted. You can either allow or deny connections in a few different ways. For each connection, you can set "allow" or "deny" once, until the application quits. You can also allow or deny a connection to the IP address or host that the application is trying to reach.
The first time that you run Little Snitch, you might get a little overwhelmed with all those pop-up windows asking you what you want to do. If you really trust an application, simply click on "allow forever" and "any connection", and you won't see pop-ups for that application anymore. The good thing is that these rules that you make can be modified later on in the Little Snitch "Configuration" menu.
Perhaps, the best part of Little Snitch is the activity monitor that you see on the top-right part of your screen. This little window shows the names of the applications that are receiving and sending information and the IP address or host that they are establishing connections with.
All in all, Little Snitch is a great tool for keeping track of what your applications are sending and receiving and it is very customizable and rather easy to use.
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