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Connection Blocking settings apply to the incoming and the outgoing connections that use a specific application, service, port, or IP address.
Outgoing Connections Blocked
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.
If your app is using the App Sandbox, you've to set the capability to allow outgoing (Client) connections to allow the app to have access to the internet. Xcode 9 enables the App Sandbox by default but the capabilities for outgoing connections need to be set explicitly. So above are the two apps that will be helpful to Prevent Apps from Accessing Internet on Mac.Use these tools and you can easily manage all the internet access to the different apps on your Mac and that will help you to save a large amount of internet data and your bandwidth. Change Server Settings in Mail on Mac. Use Server Settings preferences in Mail to change options for an account’s incoming and outgoing (SMTP) mail servers. To change these preferences in the Mail app on your Mac, choose Mail Preferences, click Accounts, then click Server Settings. Open Mail for me. How do you prevent outgoing Internet connection in a Mac? In Mac OS X there is an inbuilt firewall that enables you to block incoming Internet connections. Those access requests were from I apps I use and want to have that access, but it is still surprising to see how many apps want to call home as your Mac starts up. As you allow and deny.
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.
Monitor Outgoing Connections
![Block incoming and outgoing connections Block incoming and outgoing connections](/uploads/1/3/4/1/134138089/788425795.jpg)
- 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:ApplicationsLets you specify the Connection Blocking settings for the applications that run on your Mac.Services/PortsLets you specify the Connection Blocking settings for the services and ports that run on your Mac.ZonesLets you specify the IP address to or from which firewall allows or blocks connections.All, in order of precedenceLets 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:IncomingLets you specify the access settings for the incoming connections that use an application or a service that runs on your Mac.OutgoingLets you specify the access settings for the outgoing connections that use an application or a service that runs on your Mac.Incoming & OutgoingLets 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 settingsLets 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 settingsLets you specify the advanced firewall options.Reset to defaultsLets you reset configuration to default level.
- Click Done.