Hyper-V: Update List for Windows Server 2012

The latest Hyper-V service packs, updates, and hotfixes for Windows Server 2012 are listed here in chronological order.

Applies To: Windows Server 2012

These updates and hotfixes can help avoid some known issues and may save you a support call.
A hotfix is intended to correct only the problem that is described in the article. You should not apply the hotfix if you have not seen the symptoms.

Note: A catch 22, do you install it to try preventing the problem from occurring or do you only install it if you see the problem and have an outage?

Note: Some updates are required only under certain circumstances, as noted in the table.

note Note: On this link you can find a tool to help you identify which hotfixes and updates are installed and missing:
http://www.hyper-v.nu/archives/hvredevoort/2013/06/updated-windows-server-2012-hyper-v-and-cluster-hotfixes-and-updates/

Active Updates (Not Superseded by a Newer Update):

KB Article and Date Published	Recommended?	IC Version	Applies to:	Availability
KB 2756872: Windows 8 Client and Windows Server 2012 General Availability Update Rollup (http://support.microsoft.com/kb/2756872) Published on 10/2/2012	Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of networking-related issues in Windows Server 2012 RTM	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2770440: Poor performance when you enable RemoteFX in Hyper-V on a Windows Server 2012-based computer that uses AMD processors (http://support.microsoft.com/kb/2770440) Published on 10/17/2012	Yes, if hosting a VDI platform on Hyper-V and using AMD processors	N/A	Windows Server 2012	Hotfix
KB 2770917: Windows 8 and Windows Server 2012 cumulative update: November 2012 (http://support.microsoft.com/kb/2770917) Published on 11/2/2012	Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues including: -Backup failure when using pass-through disks with Hyper-V VMs -Operating System stability -Networking-related issues	6.2.9200.16433 (2008 and later guests) 6.2.9200.16384 (2003 and XP guests)	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2779768: Windows 8 and Windows Server 2012 cumulative update: December 2012 (http://support.microsoft.com/kb/2779768) Published on 11/20/2012	Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues including: -Network teaming -Network virtualization -Storage issues, including iSCSI -Other networking-related issues	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2785638: You cannot use the Cisco SR-IOV network adapter on a virtual machine in Windows Server 2012 (http://support.microsoft.com/kb/2785638) Published on 12/1/2012	Yes, if you use a SR-IOV network adapter with virtual function (VF) capability and you find that the VF is not available on restart of the VM	N/A	Windows Server 2012	Hotfix
KB 2795944: Windows 8 and Windows Server 2012 update rollup: February 2013 (http://support.microsoft.com/kb/2795944) Published on 1/16/2013	Yes, includes a number of storage-related (MPIO, NTFS) and network-related fixes	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2803748: Failover Cluster Management snap-in crashes after you install update 2750149 on a Windows Server 2012-based failover cluster (http://support.microsoft.com/kb/2803748) Published on 1/17/2013	Yes, if KB 2750149 is installed (KB 2750149 is available via Windows Update)	N/A	Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2807654: "0x000000C2" Stop error when you try to back up a data deduplication-enabled volume in Windows 8 or Windows Server 2012 (http://support.microsoft.com/kb/2807654) Published on 1/31/2013	Yes, install on all Hyper-V hosts and supporting storage servers to prevent a crash during backup when using a deduplication-enabled volume	N/A	Windows 8, Windows Server 2012	Hotfix, Catalog
KB 2809117: Add-TargetPortToMaskingSet PowerShell command fails in Windows Server 2012 (http://support.microsoft.com/kb/2809117) Published on 2/1/2013	Yes, but this update applies to Windows Server 2012 file servers / storage servers supporting a Hyper-V environment This issue may cause the Virtual Machine Manager Configuration Analyzer (VMMCA) for System Center 2012 to fail when you use a storage subsystem that supports multi-port per view selection	N/A	Windows Server 2012	Hotfix
KB 2795531: You cannot log on to a virtual machine that is running Windows 8 or Windows Server 2012 in a VDI environment (http://support.microsoft.com/kb/2795531) Published on 2/2/2013	Yes, if using Hyper-V in a VDI or Remote Desktop Virtualization Host scenario with Windows 8 or Windows Server 2012 as virtual machines	N/A	Windows Server 2012	Hotfix
KB 2811660: Windows 8 and Windows Server 2012 update rollup: March 2013 (http://support.microsoft.com/kb/2811660) Published on 2/2/2013	Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues including: -Hyper-V switch extensions -Storage issues / data corruption -Misc networking issues	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2806542: "0x000000D1" Stop error on a virtual machine in Windows Server 2012 (http://support.microsoft.com/kb/2806542) Published on 2/5/2013	Yes, this fix prevents a crash that sometimes happens when using an SR-IOV network adapter.	N/A	Windows Server 2012	Hotfix
KB 2822241: Windows 8 and Windows Server 2012 cumulative update: April 2013 (http://support.microsoft.com/kb/2822241) Published on 3/2/2013	Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues including: -Network teaming -Deduplication-enabled VHDs -VMs stored on removable devices -Other Hyper-V-, storage-, and network-related fixes	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2823643: Virtual machines freeze at the "Stopping" state after you shut down the virtual machines in Windows Server 2012 (http://support.microsoft.com/kb/2823643) Published on 3/4/2013	Yes if clustering VMs with high network load	N/A	Windows Server 2012	Hotfix
KB 2823958: Virtual switch extension cannot send packets separately through every individual network adapter in Windows Server 2012 (http://support.microsoft.com/kb/2823958) Published on 3/5/2013	Yes, if using virtual switch extensions with the intention of sending packets through every network adapter	N/A	Windows Server 2012	Hotfix
KB 2823956: You cannot connect to a database stored in Windows Azure SQL Database in Windows Server 2012 (sic) (http://support.microsoft.com/kb/2823956) Published on 3/7/2013	Yes, if using a Windows Azure SQL Database with virtual machines running on Windows Server 2012	Updated; version unknown (wiki to be updated)	Windows Server 2012	Hotfix, Catalog
KB 2825135: You cannot perform an online backup operation by using Windows Server Backup in Windows Server 2012 (http://support.microsoft.com/kb/2825135) Published on 4/3/2013	Yes, if using Windows Azure Online Backup	N/A	Windows Server 2012	Hotfix
KB 2834026: "0x00000050" Stop error when you try to create a virtual machine or copy a VHD or VHDX file to a SMB share in Windows Server 2012 (http://support.microsoft.com/kb/2834026) Published on 4/6/2013	Yes, install on all Hyper-V hosts to prevent a system crash when VHD or VHDX files are stored or copied to a remote SMB share	N/A	Windows Server 2012	Hotfix
KB 2836988: Windows 8 and Windows Server 2012 update rollup: May 2013 (http://support.microsoft.com/kb/2836988) Published on 4/8/2013	Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues including: -Adding pass-through disks to a virtual machine -Improved reliability of Storage Spaces -Misc Hyper-V, storage and networking fixes	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2836402: You cannot add VHD files to Hyper-V virtual machines in Windows Server 2012 (http://support.microsoft.com/kb/2836402) Published on 4/11/2013	Yes, to correct an issue that could prevent the addition of VHDs to virtual machines under special circumstances	N/A	Windows Server 2012	Hotfix
KB 2845533: Windows RT, Windows 8, and Windows Server 2012 update rollup: June 2013 (http://support.microsoft.com/kb/2845533) Published on 5/4/2013	Yes. Not directly Hyper-V related, but updates the Volume Shadow Copy Service binaries, which could improve backup reliability.	N/A	Windows 8, Windows Server 2012	Windows Update, WSUS, Catalog, Download Center
KB 2832478: Virtual machines crash or take a long time to complete the shutdown process on a Windows Server 2012-based host computer (http://support.microsoft.com/kb/2832478) Published on 5/7/2013	Yes. Prevents an issue that can cause a long shutdown process and/or a virtual machine crash	N/A	Windows Server 2012	Hotfix
KB 2838043: Can't access a resource that is hosted on a Windows 8 or Windows Server 2012-based failover cluster (http://support.microsoft.com/kb/2838043) Published on 5/9/2013	Yes. Not directly Hyper-V related, but updates a number of Failover Clustering-related binaries	N/A	Windows 8, Windows Server 2012	Hotfix
KB 2838988: You cannot manage permissions or create virtual machines on a file share by using System Center 2012 SP1 VMM in Windows Server 2012 (http://support.microsoft.com/kb/2838988) Published on 5/9/2013	Yes, if using a Windows Server 2012 file server to connect to SAN/NAS storage and then serving up SMB3 storage to separate Hyper-V hosts. Yes, if you have a file share that was created on an EMC VNX storage device on a computer that is running Windows Server 2012; and when you try to manage permissions or create virtual machines on the file share by using System Center 2012 Service Pack 1 (SP1) Virtual Machine Manager (VMM), the operations fail.	N/A	Windows Server 2012	Hotfix
KB 2848344: Update improves cluster resiliency in Windows Server 2012 (http://support.microsoft.com/kb/2848344) Published on 5/10/2013	Yes, install on all Hyper-V hosts and supporting storage servers if using clustering or ODX, or to prevent issues with backups	N/A	Windows Server 2012	Hotfix
KB 2844296: Shared Nothing Live Migration fails when you try to migrate a virtual machine to a destination server in Windows Server 2012 (http://support.microsoft.com/kb/2844296) Published on 5/11/2013	Yes, install on all Hyper-V hosts using Shared Nothing Live Migration	N/A	Windows Server 2012	Hotfix
KB 2851998: "The last backup did not complete successfully" error message when you back up a Windows 8 system (http://support.microsoft.com/kb/2851998) Published on 5/20/2013	Yes. Not directly Hyper-V related, but updates the Volume Shadow Copy Service volume snapshot driver, which could improve backup reliability	N/A	Windows 8, Windows Server 2012	Hotfix, Download Center
KB 2840681: Computer does not shut down after you remove a virtual switch in Windows Server 2012 (http://support.microsoft.com/kb/2840681) Published on 5/31/2013	Yes, if using Virtual Machine Queue (VMQ) with a network team	N/A	Windows Server 2012	Hotfix
KB 2853952: Active Directory database becomes corrupted when a Windows Server 2012-based Hyper-V host server crashes (http://support.microsoft.com/kb/2853952)	Yes	N/A	Windows Server 2012	Hotfix (rollup KB2855336)
KB 2854362: Vmms.exe processes freeze on certain nodes in a Windows Server 2012-based Hyper-V failover cluster (http://support.microsoft.com/kb/2854362)	Yes, if Hyper-V hosts are clustered and virtual machines are stored on scale out fileserver.	N/A	Windows Server 2012	Hotfix (rollup KB2855336)

Superseded Updates (Updates Replaced by a Newer Update, Listed Above):

KB Article and Date Published	Recommended?	IC Version	Applies to:	Availability
KB 2796995: ODX causes corruption during Live Migration (http://support.microsoft.com/kb/2796995) Published on 1/2/2013; Replaced by KB 2838669; Replaced by KB 2848344	Yes, critical patch if ODX is enabled Install KB 2838669 instead	N/A	Windows Server 2012	Hotfix
KB 2801054: VSS_E_SNAPSHOT_SET_IN_PROGRESS error when you try to back up a virtual machine in Windows Server 2012 (http://support.microsoft.com/kb/2801054) Published on 1/17/2013; Replaced by KB 2838669; Replaced by KB 2848344	Yes, includes a fix that addresses potential backup issues. Install on clustered file servers, too Install KB 2838669 instead	N/A	Windows Server 2012	Hotfix
KB 2792867: Virtual switch extension cannot send packets over different network adapters in Windows Server 2012 (http://support.microsoft.com/kb/2792867) Published on 2/2/2013; Replaced by KB 2811660	Yes, if using a virtual switch extension with the intent of sending a packet over two different network adapters Install KB 2811660 instead	N/A	Windows Server 2012	Hotfix
KB 2799728: Virtual machine enters a paused state or a CSV volume goes offline when you try to create a backup of the virtual machine on a Windows Server 2012-based failover cluster (http://support.microsoft.com/kb/2799728) Published on 2/7/2013; Replaced by KB 2813630; Replaced by KB 2838669; Replaced by KB 2848344	Yes, to prevent virtual machines from pausing and to prevent a CSV volume going offline during backups Install KB 2838669 instead	N/A	Windows Server 2012	Hotfix
KB 2813630: Virtual machine enters a paused state or a CSV volume goes offline when you try to create a backup of the virtual machine on a Windows Server 2012-based failover cluster (http://support.microsoft.com/kb/2813630) Published on 2/7/2013; Replaced by KB 2838669; Replaced by KB 2848344	Yes, to prevent virtual machines from pausing and to prevent a CSV volume going offline during backups Install KB 2838669 instead	N/A	Windows Server 2012	Hotfix
KB 2811670: Issues when the Audit object access policy is enabled on Removable Storage in Windows 8 or Windows Server 2012 (http://support.microsoft.com/kb/2811670) Published on 3/2/2013; Replaced by KB 2822241	Yes, to prevent issues with VM storage on removable devices on systems where the audit object access policy is enabled Install KB 2822241 instead	N/A	Windows 8, Windows Server 2012	Hotfix
KB 2819564: Data corruption occurs when you merge Data Deduplication-enabled VHDs in Windows Server 2012 (http://support.microsoft.com/kb/2819564) Published on 3/2/2013; Replaced by KB 2822241	Yes, to prevent data corruption when data deduplication-enabled VHDs are merged Install KB 2822241 instead	N/A	Windows Server 2012	Hotfix
KB 2833586: Virtual machine does not come online after you add a pass-through disk to the virtual machine in Windows Server 2012 (http://support.microsoft.com/kb/2833586) Published on 4/8/2013; Replaced by KB 2836988	Yes, to prevent issues with adding pass-through disks with WMI or System Center Virtual Machine Manager Install KB 2836988 instead	N/A	Windows Server 2012	Hotfix
KB 2836121: An update for Storage Spaces in Windows 8 and Windows Server 2012 is available (http://support.microsoft.com/kb/2836121) Published on 4/8/2013; Replaced by KB 2836988	Yes, to improve reliability with Storage Spaces. Install this on file servers supporting Hyper-V storage, too Install KB 2836988 instead	N/A	Windows 8, Windows Server 2012	Hotfix
KB 2824600: Virtual machine enters a paused state or goes offline when you try to create a backup of the virtual machine on a CSV volume in Windows Server 2012 (http://support.microsoft.com/kb/2824600) Published on 4/10/2013; Replaced by KB 2838669; Replaced by KB 2848344	Yes, to prevent virtual machines from pausing and to prevent a CSV volume going offline during backups Install KB 2838669 instead	N/A	Windows Server 2012	Hotfix
KB 2838669: Update that improves cluster resiliency in Windows Server 2012 is available (http://support.microsoft.com/kb/2838669) Published on 4/12/2013; Replaced by KB 2848344	Yes, install on all Hyper-V hosts and supporting storage servers if using clustering or ODX, or to prevent issues with backups Install KB 2848344 instead	N/A	Windows Server 2012	Hotfix
KB 2842575: Storage space cannot be repaired or disks are marked as retired incorrectly when you use Storage Spaces in Windows 8 or in Windows Server 2012 (http://support.microsoft.com/kb/2842575) Published on 4/23/2013; Replaced by KB 2845533	Yes. Install on any Hyper-V host using Storage Spaces. Install KB 2845533 instead	N/A	Windows 8, Windows Server 2012	Hotfix
KB 2840565: Calls made by using pass-through APIs fail on a Windows Server 2012-based computer (http://support.microsoft.com/kb/2840565) Published on 5/9/2013; Replaced by KB 2838988	Yes, if using a Windows Server 2012 file server to connect to SAN/NAS storage and then serving up SMB3 storage to separate Hyper-V hosts. Install KB 2838988 instead	N/A	Windows Server 2012	Hotfix
KB 2848727: "Move-SmbWitnessClient" PowerShell command fails in Windows Server 2012 (http://support.microsoft.com/kb/2848727) Published on 5/10/2013; Replaced by KB 2848344	Yes, if using PowerShell automation to request a Server Message Block (SMB) client to move the associated SMB connection from the cluster node to a specified cluster node Install KB 2848344 instead	N/A	Windows Server 2012	Hotfix

See also this Knowledge Base article for a list of updates related to Windows Server 2012 Failover Clustering:

Recommended hotfixes and updates for Windows Server 2012-based Failover Clusters

For previous releases of Hyper-V, reference the following pages:

Hyper-V: Update List for Windows Server 2008 R2

And

List of updates for Hyper-V in Windows Server 2008

Wiki - Revision Comment List(Revision Comment)

| |

Comments

Carsten Siemens

24 Aug 2013 12:43 PM

Carsten Siemens edited Revision 32. Comment: Added tag: has comment
- Edit
Francesco Papini

27 Jun 2013 3:30 AM

Francesco Papini edited Revision 30. Comment: typo: superceded -> superseded
- Edit
Hans Vredevoort - MVP (Virtual Machine)

21 Jun 2013 3:23 AM

Hans Vredevoort - MVP (Virtual Machine) edited Revision 29. Comment: Added a link showing how to identify installed/missing hotfixes and updates
- Edit
Frank E Lesniak

20 Jun 2013 2:10 PM

Frank E Lesniak edited Revision 28. Comment: Added KB 2834026, KB 2832478, KB 2844296, KB 2838988
- Edit
Frank E Lesniak

20 Jun 2013 12:58 PM

Frank E Lesniak edited Revision 27. Comment: Added KB 2825135
- Edit
Frank E Lesniak

20 Jun 2013 12:27 PM

Frank E Lesniak edited Revision 26. Comment: Added KB 2845533 and KB 8511998
- Edit
Frank E Lesniak

20 Jun 2013 9:16 AM

Frank E Lesniak edited Revision 25. Comment: Adding KB2838043
- Edit
Frank E Lesniak

20 Jun 2013 7:45 AM

Frank E Lesniak edited Revision 24. Comment: Added KB 2848344 to replace KB 2838669 and KB 2848727
- Edit
Frank E Lesniak

8 Jun 2013 4:06 PM

Frank E Lesniak edited Revision 23. Comment: Moved superceded hotfixes to their own table
- Edit
Frank E Lesniak

8 Jun 2013 3:28 PM

Frank E Lesniak edited Revision 22. Comment: Moved superceded hotfixes to a separate table
- Edit

Wikis - Comment List

Posting comments is temporarily disabled until 10:00am PST on Saturday, December 14th. Thank you for your patience.

Posted by Richard Mueller

on 4 Feb 2013 7:08 PM

Richard Mueller edited Revision 1. Comment: Removed (en-US) from title
Edit
Posted by AustinB

on 1 Mar 2013 2:50 PM

Avoid data corruption with WS2012 Hyper-V cluster connected to a SAN! This bug with ODX and NTFS has caused a lot of pain for me and my team over the past week. Virtual machine files become corrupted during a live migration using ODX. It took down a domain controller and two customer environments. Initial recommendation from MS was to disable ODX. There has been two hotfixes released. Not very trusting of them yet, we opted to disable ODX for now.

support.microsoft.com/.../2796995
Edit
Posted by Marty Chen

on 14 Mar 2013 10:02 PM

We need to update this list, here is another hotfix for WS2012 Hyper-V, "0x000000D1" Stop error on a virtual machine in Windows Server 2012

support.microsoft.com/.../en-us
Edit
Posted by ClaudioG64

on 16 Mar 2013 4:14 AM

I totally agree with AustinB.

The mentioned kb2796995 is CRITICAL, the bug causes huge problems.

At the moment it isn't mentioned in the 2012 Failover Cluster fix list either (and it should)
Edit
Posted by ArdenW

on 1 Apr 2013 9:47 AM

ArdenW edited Revision 10. Comment: Corrected a KB2785638.
Edit
Posted by Frank E Lesniak

on 29 Apr 2013 1:26 PM

Frank E Lesniak edited Revision 18. Comment: Added link to the KB article that lists WS2012 failover cluster hotfixes
Edit
Posted by Mehmet PARLAKYİĞİT

on 24 May 2013 12:53 AM

Thanks
Edit
Posted by Frank E Lesniak

on 8 Jun 2013 1:42 PM

Frank E Lesniak edited Revision 21. Comment: Re-ordered updates according to their publication dates. Added missing updates
Edit
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Hyper-V: Update List for Windows Server 2012