Event ID 12681 — NIC Configuration

Applies To: Windows Server 2008

This is preliminary documentation and subject to change.

This Aspect refers to network switchport, static and dynamic MAC address issues.

Event Details

Product: Windows Operating System
ID: 12681
Source: Microsoft-Windows-Hyper-V-VStack-SynthNic
Version: 6.0
Message: The VirtualSystemIdentifier %5 for "%4" (%3) conflicts with another adapter.


Change Virtual System Identifier of the NIC

The VirtualSystemIdentifier of the virtual machine NIC is not unique. Turn Off the virtual machine and set the VirtualSystemIdentifier using the scripted WMI process you used to set the property. Alternatively, delete the NIC, create a new one, and then restart the virtual machine.

Note: Turning off a virtual machine is equivalent to powering off a computer, so data loss is possible.


The virtual machine starts and runs network operations without any problems.

NIC Configuration