Event ID 28 VMSMP RRS feed

  • Question

  • Hi

    We have setup 4 new Windows 2008 R2 server with  6 nics 3 teamed (Broadcoms all upto date drivers BIOS etc)  There is currently no VM's on the server - we have noticed this error every few seconds in the event log.

    Log Name:      System
    Source:        VMSMP
    Date:          23/10/2009 13:43:48
    Event ID:      28
    Task Category: None
    Level:         Warning
    Keywords:      Classic
    User:          N/A
    Computer:      **********
    Port 'D2F437ED-6D58-4A90-8B5D-1AE5A6542E79' was prevented from using MAC address '00-24-E8-3E-79-AA' because it is pinned to port '1520475F-D477-4C07-955F-D3E37B1AC5CA'.
    Event Xml:
    <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
        <Provider Name="VMSMP" />
        <EventID Qualifiers="32768">28</EventID>
        <TimeCreated SystemTime="2009-10-23T12:43:48.368713300Z" />
        <Security />

    Any way after adding a VM to one of the Host servers we then get an issue were as the VM loses network connectivity probably 4 or 5 times a day.

    Any help on this would be great its driving us crazy.
    Friday, October 23, 2009 1:08 PM

All replies

  • Hi there.

    Last week I've setup an W2k8R2 Hyper-V Cluster with Intel NIC 1000 PT.
    The acutal W2K8R2 driver from Intel has a VMLB (Virtual Machiine Load Balancing) option which we want to use.
    Since then we also have this event every few minutes in both node system eventlog.
    The MAC-Address mentioned in the event entry is the MAC address of the Team-Adapter.
    I can not say that there are problems but the system is not yet "very" productive..... only two VM which seems to function without problems.
    I've already disabled TCP offloading on the physical team member with no success....

    I will also say: Any help would be great.


    Monday, December 14, 2009 4:16 PM
  • Same thing here..

    Nic Teaming + Hyper-V = EvendID 28 ??

    Thanks to share your experience and knowledge :)

    Best regards,


    Monday, March 29, 2010 6:41 PM
  • Hello,

    check this article about MAC address collision in Hyper-V:


    Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights.
    Tuesday, March 30, 2010 8:04 AM
  • We already use SCVMM. All mac addresses are fine as I can see..

    Any other ideas?



    Tuesday, May 25, 2010 7:22 PM
  • any news?
    Wednesday, June 9, 2010 2:22 PM