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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

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Question marked as Top-ranking reply

Posted on Dec 22, 2017 8:35 AM

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.

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 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

System Extension Blocked - but can't allow extension

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