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

Applies to: Windows Server 2019, all versionsWindows Server version 1803Windows Server version 1709 More


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. 


Because the Plug and Play (PnP) manager auto-generates unique instance IDs when duplicates are found, this error 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:


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