Mac – How to fix VMWare Fusion Pro 10, “Cannot find a valid peer process to connect to”

virtual machinevmware-fusion

I recently upgraded to macOS High Sierra and VMWare Fusion Pro 10.

My Windows 10 Pro VM will no longer run. When I open it with Fusion, I see the following message:

"New Features are avialable for your virtual machine.
To upgrade, power off this virtual machine and choose "Virtual Machine > Settings… > Compatibility"."

If I follow this instruction, VMWare says it cannot upgrade the machine till it is powered off; however, I can't get the machine to resume because: "Cannot find a valid peer process to connect to"

How can I fix this problem?

Best Answer

With help from Daniel I was not able to find the solution although it took me a bit to find the right area. I have written up the process in detail below to help others resolve this issue. I found this problem often occurs when you do not allow this option during the VMWare installation or the dialog requesting this during the installation is no longer available (as was my case).

Here are the steps in detail

  1. Open System Preferences by searching in Spotlight or clicking the gear icon in the dock.
  2. On the top row there is an icon for Security and Privacy - Click that icon
  3. Near the bottom of the screen that appears following statement

System software from developer "VMWare, Inc." was blocked from loading

If you look to the right of this message. you will see a button marked Allow. Click the button and the message and the button disappear. Note you do not need to "unlock" elevated changing using the lock icon at the bottom for this to work.