You can edit the hosts file using terminal, although I'd not recommend it if you're unsure what you're doing. But doing so you can block outgoing access to specified IP addresses or websites.
May 02, 2016 The registered version, available for a one-time payment of $10, adds notifications to the app which display prompts that make this process a lot easier. Closing Words. It is certainly inconvenient to block outbound connections by default, and that is likely the main reason why Microsoft set outbound connections to allow by default. Oct 21, 2011 Although Mac OS X’s native Firewall app tries to block all connection requests from external sources, it doesn’t keep a check on internal applications that send requests to connect with internet, or try to communicate over TCP or UDP ports. Sep 29, 2016 The app asks for user permission every time any process or app tries to establish a connection with the internet, and it applies these rules strictly, even to system processes. Using Little Snitch, you can block internet access even for Spotlight on your Mac, effectively stopping it from retrieving search results from the web.
Although Mac OS X contains a built-in firewall, this firewall doesn’t actually block outgoing connections. Radio Silence blocks outgoing connections only, so the two firewalls complement each. Dec 09, 2012 Hi to all seven forum. I wanted to know how do I block an outgoing internet connection of a game from firewall or additional antivirus.? I have windows seven ultimate sp1 32 bits. And avast 6 installed. In windows firewall, I cant find any option to block an application. So tell me how to block from windows firewall and avast antivirus. Block access for a program This is an important option for users who want full control of their PCs, allowing access only for the programs they trust, and blocking everything else. Ensure that blocking a program does not interrupt your network connection or any other program that requires Internet access to function properly.
If you simply want to stop your mac connecting out, why do you not simply turn off your wifi so you're not connected to the internet?
Alternatively a GUI firewall like Little Snitch would be a better option as it gives you very granular options for blocking incoming/outgoing traffic and is fairly easy to use and set up.
Connection Blocking settings apply to the incoming and the outgoing connections that use a specific application, service, port, or IP address.
You can use the Connection Blocking window to configure whether an application or a service that is allowed to connect to the Internet or to the local network. You can select the required network location from the Editing settings menu and configure the Connection Blocking settings.
You can configure the Connection Blocking settings only if the Connection Blocking option is turned on in the Advanced window.
You must have a user account that has administrator privileges to perform this task.
Block Outgoing Connections Windows 10
Start Norton.
If you see the My Norton window, next to Device Security, click Open.
In the Norton product main window, click Advanced or Settings.
On the left pane, click Firewall.
In the Connection Blocking row, click the settings icon.
In the Connection Blocking window, in the Editing settings menu, select the network location for which you want to configure the connection blocking settings.
Select an option in the View menu.
The options that appear in the View menu vary depending on the network location that you select in the Editing settings menu.
Your options are:
Applications
Lets you specify the Connection Blocking settings for the applications that run on your Mac.
Services/Ports
Lets you specify the Connection Blocking settings for the services and ports that run on your Mac.
Zones
Lets you specify the IP address to or from which firewall allows or blocks connections.
All, in order of precedence
Lets you specify the current Connection Blocking settings for the Applications, services, ports, and zones in the order of precedence.
Select one of the following tabs:
Incoming
Lets you specify the access settings for the incoming connections that use an application or a service that runs on your Mac.
Outgoing
Lets you specify the access settings for the outgoing connections that use an application or a service that runs on your Mac.
Incoming & Outgoing
Lets you configure the access settings for connections to and from the IP addresses that you specify.
This tab appears only when you select Zones in the View menu.
Use the Action pop-up menu at the bottom of the Connection Blocking window to specify other connection blocking preferences. Your options are:
Logging and notification settings
Lets you specify the type of access attempts for which your Norton product must maintain records.
You can also specify the type of access attempts about which your Norton product must notify you.
Advanced settings
Lets you specify the advanced firewall options.
Reset to defaults
Lets you reset configuration to default level.
Click Done.