Applies to: Sophos Home Premium and Free (Mac) on macOS 10.13, 10.14 and 10.15
System Extension Blocked - A program tried to load a new system extension(s ) signed by "Sophos" ...
message appears after a new installation of Sophos Home on a computer running MacOS High Sierra 10.13 to 10.15
Action Required - You need to change your 'Security & Privacy' settings in order to protect this computer
Note: If you are receiving Legacy system extension warnings
please see this article instead:
Legacy System Extension -"Sophos" will be incompatible in the future
The new release of macOS High Sierra 10.13 has introduced a new security mechanism called Secure Kernel Extension Loading (SKEL). This feature requires user approval before loading new non-Apple kernel extensions (KEXT). If you have not approved the Sophos KEXT right after the installation, the System Extension Blocked notification appears. For new installations of Sophos Home to be fully functional, the additional steps below are required.
- Either Click the Open Security Preferences button in the above-mentioned dialog box (which will take you to step 5) or click on the Apple menu from the taskbar then select System Preferences…
- On the System Preferences window, select Security & Privacy.
- Under the "General" section, click on the padlock at the bottom left to be able to make changes.
- Ensure "App Store and identified developers" option is selected under "Allow apps downloaded from"
- Click the Allow button next to the prompt System software from developer “Sophos” was blocked from loading at the bottom of the Security & Privacy window.
(Click on the image to see it in full size)
- Nothing happens when clicking the Allow button on macOS High Sierra 10.13
- Installing Sophos Home on Mac computers
- Technical Note TN2459
- Prepare for changes to kernel extensions in MacOS High Sierra
- Legacy System Extension - Existing software on your system signed by "Sophos" will be incompatible in the future