![mac os firewall settings greyed out mac os firewall settings greyed out](https://i.stack.imgur.com/ep5Jv.png)
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![mac os firewall settings greyed out mac os firewall settings greyed out](https://brownspirit837.weebly.com/uploads/1/2/5/7/125703578/748978731.jpg)
However, you can choose Block Incoming Connections to prevent that application from receiving any communications. By default, the setting is Allow Incoming Connections (including both your local network and the Internet). You can edit the settings in a specific application by clicking the pop-up menu on the right side of the entry.To delete an application from the Allowed list and return it to blocked status, select it in the list and click the button with the minus sign.
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Remember: Only third-party applications you install yourself will likely need to be added to the Allowed list, because all the applications that Apple includes with your Mac are already on the list. Click the application to select it and then click Add.
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Click the button with the plus sign at the bottom of the list and then navigate to the application that needs to communicate with the outside world. You can manually add an application to the Allowed list.
![mac os firewall settings greyed out mac os firewall settings greyed out](https://i.imgur.com/DfODs4o.png)
If an application without a security certificate tries to access the Internet, your Mac displays a dialog prompting you for confirmation, and you can decide yes or no.
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After you do, software you’ve installed that’s accompanied by a valid security certificate (including any application from Apple and most major third-party software developers) is automatically added to the Allowed list you see on the Firewall Options sheet.