Article ID: 114850, created on Sep 27, 2012, last review on May 11, 2014

  • Applies to:
  • Virtuozzo containers for Windows 4.5
  • Virtuozzo containers for Windows 4.0


Device Manager snap-in shows unknown devices and exclamation marks on devices inside the container:


This is a cosmetic issue that occurs with older versions of Parallels Virtuozzo Containers for Windows and is fixed in Parallels Virtuozzo Containers for Windows 4.6.

The root cause of the issue is the KSAL (Kernel Services Abstraction Layer) engine of PVCfW, which blocks unused drivers inside containers and results in this behavior.

NOTE: The issue has only cosmetic effects; it does not affect hardware functionality at all.

Parallels Virtuozzo Containers for Windows provides OS-level virtualization; hence, the host system hardware is propagated to containers in the exact same way it is available for the host.


Consider upgrading to Parallels Virtuozzo Containers for Windows 4.6. Otherwise, these warnings can be ignored.

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