Event ID 56 is logged in Windows Server 2008 R2 and the later versions of Windows Server

Applies to: Windows Server, version 1903Windows Server 2019, all versionsWindows Server version 1803

Symptoms


Scenario 1

Two or more non-volatile memory express (NVMe) devices of the same make / model are attached to a Windows Server 2016 or Windows Server 2019-based computer.

Scenario 2

Multiple paths are available to a disk in Windows Server 2008 R2 and later versions.

In these scenarios, you receive event ID 56 in the System log.

Cause


The issue occurs because the Plug and Play (PnP) manager auto-generates unique instance IDs when duplicates are found.

Resolution


This event ID can safely be ignored, and no user action is required.

Note In Windows Server 2012, Windows Server 2012 R2, and Windows Server 2016, you might see the event displayed but without the correct Description field, as shown below. However, the driver name and the child device name are correct and can be used to identify the driver involved and the name of the child device.

The description for Event ID 56 from source Application Popup cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event. The following information was included with the event:

SCSI
000000

The message resource is present but the message is not found in the string/message table.