MacOS High Sierra (10.13) MacRumors attracts a broad audience of both consumers and professionals interested in the latest technologies and products. We also boast an active community focused on purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms. After installing Avast Security, Avast Premium Security, or Avast Omni, you may see the status message This Mac is in passive mode. This is because the Core Shields are disabled due to the Avast Software extensions being blocked by your macOS. To allow Avast Software extensions, follow the instructions below.
I was experiencing the same issue, but it was solved after quitting the software MagicPrefs.
I came across this article, ESET system extension blocked in macOS 10.13 (High Sierra)—ESET Knowledgebase, where it suggests that the reason for the allow button not responding could be 'You are using a third-party application to emulate mouse or trackpad (such as MagicPrefs, Synergy, BetterTouchTool ...). You need to close or uninstall this application in order to restore access to the Allow button'
Apr 22, 2018 6:32 PM
Hi,Today I couldn't run a Windows 10 VM on a Mac Host, nor update my VirtualBox 6.x to version 6.1.14. In both cases I receive an error saying that the 'Kernel driver not installed (rc=-1908)'. I don't remember to have updated High Sierra since the last time I run VirtualBox, nor changed anything in my system.
By searching in the forum, I see that this may be caused by the VB kernel extensions being blocked by High Sierra. EtreCheck says, actually, that all the VB extension are not loaded:
[Not Loaded] VBoxDrv.kext (Oracle America, Inc., 6.1.14)
[Not Loaded] VBoxNetAdp.kext (Oracle America, Inc., 6.1.14)
[Not Loaded] VBoxNetFlt.kext (Oracle America, Inc., 6.1.14)
[Not Loaded] VBoxUSB.kext (Oracle America, Inc., 6.1.14)The trick of going to the Security System Preference didn't work, since there is no button to trust Oracle. Is there any other way to tell the Mac to load those extensions?
And, since I don't remember having changed anything in my system (apart for the usual cleaning with Cocktail), does this reveal some other type of issue?
Avast High Sierra System Extension Blocked High Sierra 10 13 5
Thanx!
Avast High Sierra System Extension Blocked Legacy Developer Hp
Paolo