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In macOS 10.13, Apple introduced a new feature that prompts requires users to approve any third‐party extensions (KEXTS). Although the GlobalProtect app is compliant with the KEXT change, the pop‐up prompts can cause confusion. There . The pop-up alert will indicate that a System Extension has been blocked and to enable the extension go to the Security & Privacy System Preferences pane. You only have 30 minutes to approve the KEXT 

There are two possibilities for what the problem might be and the relevant solution.

https://developer.apple.com/library/archive/technotes/tn2459


Expand
bgColor#fff
titleVPN client upgrade

If the macOS system had an older VPN client installed and the connection problem started after the client was upgraded then the GlobalProtect enforcer kernel extension may not have updated correctly. Follow these steps to fix this problem.

  1. Uninstall the GlobalProtect client for macOS.
  2. Determine if the GlobalProtect enforcer kernel extension exists on the macOS system.
    Open the Terminal application under the Applications > Utilities folder, then enter the following command:
    kextstat | grep gplock
  3. If the extension exists, unload the enforcer.
    Enter the following command on the Terminal application to unload the enforcer:
    sudo kextunload -b com.paloaltonetworks.GlobalProtect.gplock
  4. Prevent the enforcer from reloading after a reboot.
    Enter the following command on the Terminal application to remove the enforcer from the macOS hard
    disk:
    sudo rm -r "/System/Library/Extensions/gplock.kext"*
  5. Download and Install the GlobalProtect App for Mac.

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