Level 1

45 points

System Extension Blocked - but can't allow extension

I installed macOS 10.13 High Sierra yesterday. This morning, when trying to boot up my VMWare for the first time since the install, I got the following error message:

"System Extension Blocked

A program tried to load new system extension(s) signed by "VMWare". If you want to enable these extensions, open Security & Privacy System Preferences"

The problem is that when I go to Security & Privacy, there is no option to 'Allow' the extension. I have read that this was a known bug in the beta versions of High Sierra, but surely this was fixed before release!?

I am also now getting exactly the same problem with my Symantec anti-virus. Same error message and still no option option to 'Allow' the extension.

I would be grateful to anyone that has been able to resolve this.

MacBook Pro with Retina display, macOS High Sierra (10.13)

Posted on Sep 27, 2017 1:24 AM

Top-ranking reply

glenhenshaw

Level 1

14 points

Posted on Oct 13, 2017 10:17 AM

There is a workaround for this. It isn't a great workaround, security-wise, but it does get you back to the behavior of macOS 10.12. Basically, you can turn off the security feature requiring user approval of Kernel Extensions.

First, boot into Recovery Mode by rebooting and pressing and holding command-R as soon as you see the Apple logo. On my machine, I had to hold command-R for quite a while, at least 60 seconds.

Eventually you will see a screen that gives you a couple of options, including reinstalling or running Disk Utility. If you look at the top of the screen, where the Apple menu would ordinarily be, you will see a "Utilities" drop-down menu. Click on that and select Terminal. A window will open up that allows you to type text-based terminal commands.

You will see a "$" prompt in the terminal window. Type the following:

spctl kext-consent disable

then press Return. You should see:

Kernel Extension User Consent: DISABLED

Please restart for changes to take effect.

Then reboot your Mac, and you should be good. You will no longer see the notification panes telling you a Kernel Extension was blocked; they will all be automatically allowed, just as they were in macOS 10.12.

I would recommend waiting until 10.13.1 or 10.13.2 to see if the issue gets fixed, and then undoing this fix by repeating the same steps, but typing

spctl kext-consent enable

instead.

For more information, see the following website:

User Approved Kernel Extension Loading… – Pike's Universum

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113 replies

Aug 24, 2018 2:02 PM in response to robGTR

I've tried getting my Jack Lo Evoluent Vertical mouse working and I have synergy and a whole bunch of garbage installed. I used killall synergy-service/core/config and used ps aux | grep synergy to see if it was still running. I also pretty much disabled anything "screen share" wise and disabled AVG. Turned off bluetooth and jammed allow over and over and all of a sudden it went through. Took me an hour of figuring this out but now my mouse is programmable.

Sep 3, 2018 3:27 AM in response to mpdharley

I was able to fix this issue by disabling my both Logitech Bluetooth devices (mouse and keyboard) and clicking the "Allow" button with built-in touchpad of my MacBook Pro, like it is advised here:

https://support.intego.com/hc/en-us/articles/115001273551-Intego-Extensions-Bloc ked-in-macOS-High-Sierra-10-13

Sep 7, 2018 5:31 AM in response to robGTR

I found an interesting fix for remotely clicking on the Allow button, after reading the post below that uses the tell operation to do the click I was wondering how to, remotely, find out the coordinates of the pixel that needs clicking so I launched Automator and tried recording the click event, hoping that this would record the location, and low and behold the click worked directly and the extension is now registered 😀. Perhaps since this is done through automator Apple won't consider it to be a security hole and close it but in the mean time give this a go...

Oct 2, 2018 4:22 PM in response to robGTR

I have the Fuse System Extension Blocked message too. It says that the following:

The system extension required for mounting FUSE volumes could not be loaded.

Please open the Security & Privacy System Preferences pane, go to the General preferences and allow loading system software from developer "Benjamin Fleischer".

Then try mounting the volume again.

Who is Benjamin Fleischer? Have I been infected with a virus or hacked? My security software says that every thing is good. I don't know what to do.... Please help

Barney-15E

Level 10

122,084 points

Aug 23, 2018 6:01 AM in response to Marzoa

I don't seem to have such an option in 10.13.6

😟

You don't see this:

mnaile

Level 1

13 points

Nov 22, 2017 7:57 PM in response to robGTR

Please check out High Sierra fix for "System Extension Blocked"

RayZn

Level 1

18 points

Sep 27, 2017 2:59 AM in response to robGTR

No problem Rob. I hope we don’t have to wait for an entire system update to get this resolved!

Sep 30, 2017 7:03 AM in response to RayZn

Any word on this?

I'm having the same issue with the drivers for a 3D mouse that has been collecting dust for a few days. I would love to get it working again.

Dec 1, 2017 9:37 AM in response to harrymfa

I just experienced this too. Thanks for posting this. I had the user click "Allow" on their end and it worked fine.

Dec 27, 2017 1:45 PM in response to Daniel Schlaug

You nailed it ! Thanks !

If Apple designed this "not-really-clickable" button for security concerns, then you just hacked around it 😁

Dec 27, 2017 1:44 PM in response to johnpaulmedina

Same goes with TeamViewer (and any remote control application I guess).

Thanks for your input.

Mar 19, 2018 4:40 AM in response to Daniel Schlaug

That solved my problem, but seems like a bad design for a security measure - I'm running a headless server! Thanks for your post!

Mar 30, 2018 3:34 PM in response to robGTR

In addition to the previous posts, here's one tip that you can use.

Use tab key to tab to the "Allow" button and then press the space key, so that it can help you trigger the click behavior.

thegroff

Level 1

4 points

Apr 9, 2018 4:09 AM in response to Daniel Schlaug

Best answer ever! And it works too!

O_o__o_O

Level 1

4 points

Apr 10, 2018 9:08 PM in response to robGTR

Hello Apple team,

Please solve this problem.

Click on 'Allow..' button is not doing any action

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System Extension Blocked - but can't allow extension