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"Sytem Extension Blocked" error appears after installing Trend Micro Security for Mac (TMSM) on macOS High Sierra 10.13 (or later)

    • Updated:
    • 30 May 2019
    • Product/Version:
    • Apex One (Mac) as a Service 2019.All
    • Trend Micro Security for Mac 3.0
    • Trend Micro Security for Mac 3.5
    • Platform:
    • macOS High Sierra
    • macOS Mojave
Summary

After installing TMSM, the following message appears:

System Extension Blocked
A program tried to load new system extenssion(s) signed by "Trend Micro, Inc.". If you want to enable these extensions, open Security and Privacy System Preferences.

This prompt appears because, starting macOS High Sierra 10.13, any third-party kernel extension installation will require the user's explicit approval, called "Kernel Extension (KEXT) consent".

Details
Public

If the user fails to allow/approve the KEXT consent prompt, TMSM will not work properly. To fix this issue, follow the steps below:

  1. On the "System Extension Blocked prompt, click on Open Security Preferences. This will open the Security & Privacy window.

    System Extension blocked

  2. Under the General section, click on the Allowbutton.

    Security and Privacy

  3. Reboot the computer to apply the changes.
 
The "Allow" button will disappear automatically if not acknowledged within 30 minutes. It will appear again once the KEXT is re-loaded by restarting the Mac.
Premium
Internal
Rating:
Category:
Install
Solution Id:
1122821
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