An Event ID 56 is logged on boot in Windows Server when multiple disk paths are available

When multiple paths are available to a disk in Windows Server 2008 R2 and later versions, an error event that resembles the following may be logged in the System event log:

Log Name: System
Source: Application Popup
Event ID: 56
Level: Error
Description: Driver SCSI returned invalid ID for a child device (000000).
The issue occurs because the inbox Storport driver does not create unique instance IDs for disks exposed by multiple paths. 
Since the Plug and Play (PnP) manager will auto-generate unique instance IDs when duplicates are found, this error can safely be ignored and no user action is required.

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Article ID: 2685788 - Last Review: 11/07/2016 20:24:00 - Revision: 7.4

Windows Server 2016, Windows Server 2016 Essentials, Windows Server 2016 Datacenter, Windows Server 2012 Datacenter, Windows Server 2012 Standard, Windows Server 2012 Essentials, Windows Server 2012 Foundation, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Standard, Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows Server 2012 R2 Standard

  • KB2685788