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How to Block Outgoing Connections with Firewall Mac?

While connecting your Mac to the Internet, applications send and receive information about your network connection. You don’t need to worry about this data exchange because it is mandatory for system functions to work correctly.

If you want to know how to block outgoing connections with firewall on Mac?, Here we will explain the right procedure to do the same in this article. Read this page and learn the process in detail. Blocking outbound connections can prevent apps from connecting to unsecured networks. This is an effective way to block suspicious apps and malware. Unfortunately, macOS has no native tools or built-in methods for blocking outbound connections. But there are some methods to block a website’s IP address or domain name. However, this workaround can only block outgoing connections from your Mac to websites, not applications. Now, let’s get started with the procedures.

Block Outgoing Connections

  • To begin with, open Applications on your Mac and click Utilities> Terminal.
  • How to Block Outgoing Connections with Firewall Mac

  • In the Terminal window, type the command sudo cp /private/etc/hosts ~/Documents/hosts-backup and press Return.
  • Terminal window
  • This command creates a backup of the hosts file on your Mac. This file is essential to match the domains with their IP addresses.
  • Enter your Mac’s password and paste the command sudo nano /private/etc/hosts in the Terminal window. Then, press the Return key. This command is to provide administrator permission to change the hosts file.
  • Enter Your Mac's Password
  • Again, enter your Mac’s password and press Return.
  • Type 127.0.0.1 and press the Tab key. Then, enter the website’s URL you want to block.
  • Enter The Website's Url
  • On your keyboard, press the Control and O keys simultaneously. Then, press the Return key. Next, press the Control and X keys.
  • Finally, type “dscacheutil -flushcache” in the Terminal window and press the Return key.
  • If you want to verify whether you have blocked the outgoing connections on your Mac, launch your browser and visit the blocked website. Now, you will see an error message stating that it cannot connect to the website’s server.
  • Therefore, this is how you should block the outgoing connections on your Mac. However, many of us tend to change our decisions now and then. In case you want to unblock the blocked websites, you cannot do this by entering Terminal commands. Instead, you have to restore the backup hosts file you have created. The oncoming instructions will give you a clear insight into the procedure.

Unblock Outgoing Connections

  • On your Mac, go to Finder and click Documents.
  • Click the hosts backup file and copy its content.
  • On your Mac’s desktop screen, click the Go button at the top and select the Go to Folder option.
  • Block Outgoing Connections with Firewall Mac
  • In the dialog box, type /private/etc/hosts and drag the file to the desktop.
Block Outgoing Connections with Firewall Mac
  • Then, double-click the file and delete its content. Now, replace it with the content you have just copied (hosts backup file).
  • Close the TextEditor window and then drag the hosts file to the /private/etc/ folder.
  • When a dialog box appears asking whether you want to replace the hosts file, click the Replace button.
  • Finally, launch your browser and ensure that you can access the website you have blocked.
  • Conclusion

    This is the procedure for blocking and unblocking outgoing connections with a firewall on Mac. If you still have queries or need clarifications in how to block outgoing connections with firewall on Mac, connect with us to talk to our technical experts. They will assist you in real-time and get all your questions answered. You can reach us by making use of the call option on this page.

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