Error: "Could not open /dev/vmmon: Broken pipe" while launching the Virtual Machine

Products

• VMware Desktop Hypervisor

Issue/Introduction

Starting Virtual Machine in Fusion fails with error: Could not open /dev/vmmon: Broken pipe

Environment

• VMware Fusion 11.x
• VMware Fusion 10.x

Cause

This issue occurs on MacOS High Sierra, Mojave and Catalina as Apple requires 3rd Party Kernel extensions to be manually enabled.

Resolution

1. Launch "Disk Utility" tool from LaunchPad.
2. Ensure Macintosh HD is highlighted and click First AID.
3. Once the First AID is complete, shutdown the Mac (not restart) and boot it up.
4. Now launch VMware Fusion and follow the steps below.
5. Navigate to System Preferences > Security & Privacy on the host macOS (High Sierra, Mojave and Catalina).
6. Under the General tab towards the bottom of the window, you see error similar to:
   
   “System software from vendor “VMware, Inc.” was blocked from loading.” with option to click on “Allow”. 
7. Click Allow.
   
   Note: You need Admin Privileges to allow the application.
   If the issue persists, follow the steps mentioned below.
8. Launch Terminal and Run the following command
   
   sudo kextload -b /Applications/VMware\ Fusion.app/Contents/Library/kexts/*

Repeat Steps 5-7
9. Manually uninstalling VMware Fusion and reinstall it.
   Repeat Steps from 1 to 3
10. If the issue persists, remove the MacOS quarantine from the Fusion.dmg by following the steps mentioned in the article below.

Error: "Application cannot run correctly" Unable to launch virtual machine after Fusion install

Additional Information

• Installing VMware Fusion triggers System Extension Blocked notification on macOS High Sierra, Mojave and Catalina

Impact/Risks:

• If the Security & Privacy System Preferences is not changed to allow the application's kernel extensions to load, Fusion will show the below error when starting a virtual machine:
  
  “Cannot find a valid peer process to connect to”