System Extension Blocked - but can't allow extension

I have experienced with some of our users the same problems clicking on the allow button even in front of the Mac. What does seem to work a lot more reliably but is not suitable for many people is using an MDM system and pushing out a profile to 'whitelist' either individual Kernel Extensions or particular manufacturers team ids. See Prepare your institution for macOS High Sierra 10.13.4 - Apple Support

I therefore whitelist all the most likely manufacturers i.e. VMware, Parallels, VirtualBox aka Oracle, Sophos, Sonnet Tech, Highpoint, ATTO, Tunnelblick and so on.

This article discusses how to find the team ids and bundle ids. See - User Approved Kernel Extension Loading… – Pike's Universum

What I regard as incredibly stupid on Apple's part is that macOS as standard includes Kernel Extensions for Sonnet Tech, ATTO and Highpoint and yet these also are not trusted even though they are built-in to macOS.

High five to this man! Spent ages trying to work out why clicking Allow wasn't working - temporarily turning off MagicPrefs fixed it.

The 'Allow' button is disabled if you're running anything that modifies your mouse, touchpad or usb behaviour. This could be USB Overdrive, Better Touch Tool, etc.

Restarting my Mac in safe mode solved this blocking problem. Finally the ALLOW button works.

Hello,

for some reason I had the same issue, what helped me was to use TAB and then space to "click" the Allow button.

Hope it helps

Have you tried doing it in Safe Mode? That was the solution for me. I use it every time I need to allow a system extension now.

Thank you for your thorough update. I wLund up starting from scratch and doing a clean install and it solved my problems. I had to do a lot manually after that since I did not have a proper back up to restore from (I had a clone of my drive but since it was on beta 10.13.1 and my main machine which was on 10.13, they couldn’t properly talk to each other in order to do a restore). I think I like having a clean system anyway, and I was able to eliminate all the crud that built up over the years. I lost Photoshop CS5 in the process, but I don’t think I’ll miss it too much. I still have to work on getting my photos organized and back up on my main machine, but overall I’m very happy where I am now. In all my years and all my updates, this is the first time I ever needed to do a clean install and now I know firsthand the advantages. Best of luck to everyone!

I have been having an issue installing an Antivirus package. The Allow button was showing but clicking on it wouldnt work. To fix the problem I created a new administrators user account and have now been able to "allow" the application in Security & Privacy from within that account. I am no expert but am wondering if the existing profile now has some conflict since upgrading to High Sierra.

This was it! Clicking "Allow" over Screen Sharing doesn't work so I pulled out Script Editor and

tell application "System Events" to click at {890, 460}

Point values may of course vary. Find them by taking a screenshot, opening it in Preview and doing a selection from the upper left corner to the button.

Well, you can also consent to the specific extension(s) from recovery mode, but you need to know the team ID. The solution comes courtesy of Parallels (http://kb.parallels.com/124289) but should work for anyone, who is willing to give you the team ID.

Closing Chrome makes the button work as expected for me.

Accessibility -> Mouse keys was the easiest work around for me. I'm sitting here clicking and it doesn't work, but I enable mouse keys and we're good to go. Pretty dumb, Apple

For me, it was Chrome causing the issue.

Close Chrome and try to press the Allow button.

Okay, little update on my situation for your benefit and time savings 😝

So, my Time Machine back-ups haven't worked since I installed High Sierra, so I made a new 1TB back-up on a USB disk, that took a good 10 hours but worked fine. Then I restored my iMac from that same back-up. I wasn't expecting this to solve my problem, but the Apple Tech suggested it for if I had the time and was curious what there results would be, so why not?

The iMac restored overnight and I just woke up to an iMac that was exactly the same as it was yesterday, still not able to allow system extensions in 'Privacy and Security'. So that was a waste of time. But hey, new datapoint.

My Time Capsule has back-ups going back a few years, with the most recent being about an hour before installing High Sierra. So at the moment I'm restoring that back-up. If my research is correct, restoring this should give me back Sierra on the machine, not High Sierra. So this should basically (temporarily) solve the issue. When This back-up is restored (estimate is 33 hours to go :/ ), I can reinstall High Sierra and see what happens. If that solves it, yay. If I get the same issues again, the only option left is the nuclear one. Clean install and pluck all my files from the new Time Machine Back-up I made yesterday.

So my findings so far:

- A clean install on a separate drive has no issues

- Restoring a Time Machine back-up from after the issue arose does not solve the issue

Next options:

- Restore a Time Machine Back-up from before High Sierra was installed and update it to High Sierra

- Clean install and copy all my files from the most recent Time Machine Back-up.

Hello,

I have the same problem with vmware and paragon at job today. After lot of search eventually could fix with a NVRAM reset.Not at job before 10hours so if somebody could try and give feedback, that could be cool.

Ty