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How to Enable and Configure macOS Gatekeeper to Only Install Apps from Trusted Developers

General IT KB-880

Summary

This guide helps you troubleshoot and resolve: How to Enable and Configure macOS Gatekeeper to Only Install Apps from Trusted Developers. Follow the steps below to fix the issue.

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Common Causes

macOS Gatekeeper is a built-in security feature that helps protect your Mac from malicious software by controlling which applications are allowed to run. By configuring Gatekeeper to only allow apps from the App Store and identified developers, you reduce the risk of installing unauthorised or harmful software on your business device.

Quick Fix Steps

  1. Open System Settings from the Apple menu.
  2. Navigate to Privacy & Security.
  3. Scroll to the Security section.
  4. Select App Store and identified developers under "Allow applications downloaded from".

Detailed Instructions

Step 1: Open System Settings

  1. Click the Apple icon in the top-left corner of your screen.
  2. Select System Settings from the dropdown menu.

Step 2: Access Privacy & Security

  1. In the left-hand sidebar, click Privacy & Security.
  2. Scroll down the right-hand panel until you reach the Security section.

Step 3: Configure Gatekeeper Settings

  1. Locate the setting labelled Allow applications downloaded from.
  2. Select the radio button for App Store and identified developers.
  3. If the option is greyed out, click the Lock icon at the bottom of the window and enter your Mac administrator password to unlock changes.
Tip: "Identified developers" are software creators registered with Apple who have digitally signed their apps. This provides a balance between security and flexibility for installing professional software not available on the App Store.

Troubleshooting

App is blocked from opening

If you attempt to open an app from an unidentified developer and it is blocked, you can override Gatekeeper for that specific app:

  1. Go to System Settings > Privacy & Security.
  2. Scroll to the Security section.
  3. Click the Open Anyway button next to the blocked app notification.
  4. Enter your administrator password when prompted.
Caution: Only override Gatekeeper for applications you trust. Installing software from unidentified developers can expose your Mac to malware and compromise your organisation's data security.

Settings are managed by your organisation

If your Mac is managed by 220 Internet Services or another IT provider, these settings may be locked by a configuration profile. If you cannot change the Gatekeeper settings, please Open a Ticket for assistance.

Still Having Issues?

Need more help? If the issue persists after trying these steps, please open a support ticket and our team will assist you.

💻 Open a Ticket

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