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cyanode
Contributor
Contributor
‎09-21-2016 10:17 PM

"Could not open /dev/vmmon" on macOS 10.12

Hi,

I am currently on Fusion 8.5.0 freshly downloaded from your website. I have a couple of VMs from before I upgraded my OS to 10.12. Now none of them will start/resume and all I get is the error in the title.

I upgraded to Fusion 8.5.0 before the OS update and it worked fine, so I guess something in the OS update broke it.

I have tried searching around in this forum and have tried the following to no avail:

  1. uninstall/reinstall
  2. reboot
  3. install a new VM from image

In case it helps, I do have VirtualBox installed as well, and I need it just as much as I need Fusion.

21 Replies
glenrmarquis
Contributor
Contributor
‎01-15-2019 12:59 AM

I had the same error with Fusion and VirtualBox, I installed the oldest version of VirtualBox that I coud find, got the VMs working then upgraded to latest version 6 of VIrtual Box.

Perhaps installing a very much older compatible version of Fusion/Workstation will fix the same. Shame Fusion support have offered nothing at all for weeks and months on this one.

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louistaljaard
Enthusiast
Enthusiast
‎01-30-2019 09:51 AM

It turns out that VMWare and VirtualBox can't co-exist or at least their kernel extensions can't be running at the same time. The following manual workaround works for me, I'm on the latest macOS and VMWare and VirtualBox versions as on 2019/01/30: https://kastelo.net/blog/2017-05/coexisting-virtualbox-vmware-fusion-macos/

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