How to block outgoing Internet connections?

[Mork]

I use little snitch 5. In the past, before I had to re-install everything due to a system crash, I had little snitch configured with four rules in a separate profile to block all incoming and outgoing connections. However, after re-installing to the replaced disk and re-isntalling little snitch, I cannot get these rules to work. When I pick the "BLOCK ALL CONNECTIONS" profile, the mac still connects to the Internet. It seems that the other rules are "available in all profiles" so my blocking connection profile doesn't have any effect.

If anyone knows how to correctly configure little snitch so I can actually get it to block like it used to, I'd like to know what I did wrong. The company has not responded to repeated questions on this.

Otherwise, if there is another utility (like ZoneAlarm for Windows used to do) that just lets you click a button to disable incoming and outgoing connections, or a simple shell command, or similar, please let me know.

Thanks very much,

 

[chabig]

I had little snitch configured with four rules in a separate profile to block all incoming and outgoing connections

If your intent is not to connect to the network at all, it would be easier to just turn off wifi. But I doubt that is really what you're trying to accomplish, so it would help if you could better explain your goal.

 

[Mork]

The goal is to, for security, be able to click a button (like little snitch used to do) to disable all outgoing and incoming connections to the Mac.

This mac is directly wired to the hub, no Wifi.

Thanks for your reply.

 

[chabig]

Then you're making it too complicated. just unplug the ethernet cable. Voila! No network connection.

 

[Mork]

That's not what I'm looking for. How long until the little clipping thing breaks off? No, I'm looking for a more elegant solution using a utility.

Perhaps I'll try to create a totally new profile in little snitch called "allowed" and move all the "allowed in all connections" rules into that. Then I should have two distinct rule sets.

Has anyone done this?

 

[chabig]

You don't need a utility. The OS already offers this capability in Network Preferences:

1. At the top, open the Location drop down menu
2. Select "Edit Locations"
3. At the bottom, next to the minus sign, open the menu and choose "Duplicate location"
4. Rename it to "No Network" and click Done
5. Now, with the "No Network" location selected, click the minus sign to delete every network interface.
6. Click Apply

Now you can go to the Apple menu at any time and switch your network setting between "Automatic" and "No network"

 

[chrfr]

That's not what I'm looking for. How long until the little clipping thing breaks off? No, I'm looking for a more elegant solution using a utility.

Perhaps I'll try to create a totally new profile in little snitch called "allowed" and move all the "allowed in all connections" rules into that. Then I should have two distinct rule sets.

Has anyone done this?

In Big Sur 11.1 and earlier, utilities like Little Snitch cannot block Apple services from connecting to the internet. This looks like it will be changed in 11.2 but it may also require an update to Little Snitch to work. Edit: I can't link directly to the post because of the Macrumors obscenity filter so go here: https://blog.obdev.at

 

[Mork]

That is ... AMAZING!

THANK YOU THANK YOU THANK YOU.

Perfect.