VM Network Connectivity Dropped under high load

VM Network Connectivity Dropped under high load

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A while ago I posted about a hotfix that would correct a problem where virtual machine network connectivity would be dropped under heavy network load (original blog post here).

Unfortunately this specific fix was not included in Windows Server 2008 R2 Service Pack 1.  We have released a new hotfix to address this problem on systems running Windows Server 2008 R2 Service Pack 1.  You can download it from here:



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  • Do you think we will see this in time as a Windows Update? Or should I install this on our servers now, even though we are not having the issue?

  • Hey Ben,

    The Hyper-V Update List for Windows Server 2008 R2 (technet.microsoft.com/.../ff394763(WS.10).aspx) says that KB2517329 supersedes KB2263829.  Are you saying that we need both hotfixes or is KB2517329 sufficient?

  • Sam -

    Unfortunately I do not know if / when this will be on Windows Update.  It is up to your judegment to figure out whether you want to apply this fix or not.

    Scott -

    Yes, you only need to install KB2517329 - but as that is targetted at a narrower problem I did not include it in this article.



  • Hi Ben

    if i previously had the hotix pre sp1 and then i install sp1 on my hosts does that overwrite the fix? so do i then need to install the new hotfix?



  • Matt -

    Unfortunately you will need to install the new hotfix.



  • Does this Hotfix upgrade the Integration Components, requiring the guest VM's to be upgraded as well?

  • Mark -

    No, you do not need to update integration services.



  • Do I need to apply the hotfix to the host server as well, or just the guest VM?

  • Huskyphan -

    The hotfix applies only to the host server.  You do not need to do anything to the VM.



  • How to download this KB2517329, there's no download link... ?

  • @Bob

    from the KB page

    "How to obtain this update

    The following file is available for download from the Microsoft Download Center:



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