Mastercam — Virtual Usb Multikey Not Working

Sometimes the driver is installed but Windows fails to recognize the device.

  • If the device appears under "Other devices" as an unknown device, right-click it and select Update Driver -> Browse my computer for drivers -> Let me pick from a list of available drivers on my computer. Select USB Input Device or HASP if available.
  • Confirm correct license server settings:
  • Ensure Sentinel/Hasp drivers match the Mastercam version’s supported driver recommended by the vendor.
  • If the virtual key is missing or shows “Unknown,” reinstall the license or contact vendor.

    • Before fixing the problem, you must understand what you are dealing with.

    The Virtual USB Multikey is a kernel-mode driver (typically mulfox.sys, multikey.sys, or vusbbus.sys) that creates a virtual USB controller in Windows Device Manager. Mastercam's licensing service looks for a physical HASP (Sentinel HL) on the USB ports; the virtual driver tricks the software into thinking a real dongle is plugged in.

    For persistent Code 10 / 39:

  • Reboot → Reinstall driver.

    • For IT administrators or frequent sufferers, this batch script resets the Multikey in one click.

    Save as reset_multikey.bat and Run as Administrator:

    @echo off
echo Stopping and removing old Multikey...
net stop multikey
sc delete multikey

    echo Removing driver from System32...
del /f /q C:\Windows\System32\drivers\multikey.sys mastercam virtual usb multikey not working
    

    echo Reinstalling driver...
copy "%~dp0multikey.sys" C:\Windows\System32\drivers\multikey.sys
    

    echo Creating and starting service...
sc create multikey type=kernel start=auto binPath=C:\Windows\System32\drivers\multikey.sys
sc start multikey
    

    echo Disabling signature enforcement...
bcdedit /set testsigning on Sometimes the driver is installed but Windows fails
    

    echo Restarting Device Manager refresh...
pnputil /scan-devices
    

    echo Done. Reboot now? (Y/N)
pause

    St. John's eNewsletters