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

order with most recent updates placed at the top.

 

Applies To: Windows Server 2012

 

Note: 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: On this link you can find a tool to help you identify which hotfixes and updates are installed and missing:

 

 

 

Data

KB Article

Recommended?

OS

Type

10 Jun 14

KB 2955163:  Windows RT, Windows 8, and Windows Server 2012 update rollup: May 2014

Yes



Includes



KB2956020

KB2949807 

KB2957654

KB2957560 

KB2957623 

W8

WS2012

 WU

WSUS

Catalog

DL Center

14 Apr 14

KB 2937634: Hyper-V Host Unable To Reconnect To WS2012 SOFS After Unplanned Failover

Yes, if used with Scale-Out File Server

W8

WS2012

Hotfix

10 Apr 14

KB 2928439:  VM Network Fails If “Minimum Bandwidth Weight” Is Enabled On WS2012 Hyper-V

Yes

WS2012

Hotfix

10 Apr 14

KB 2908783: Data Corruption Occurs On iSCSI LUNs In Windows

Yes

WS2012

Hotfix

9 Apr 14

KB 2928678: Windows RT, Windows 8, and Windows Server 2012 update rollup: March 2014

Yes

 

Includes

KB2922514

KB2925429

KB2925981

KB2927910

KB2908783

KB2929414

KB2928562

KB2930287

 

W8

WS2012

WU

WSUS

Catalog

DL Center

8 Apr 14

KB 2908783: Data corruption occurs on iSCSI LUNs in Windows

No

Included in KB928678

W8

WS2012

 

14 Jan 14

KB 2870270 Update that improves cloud service provider resiliency in Windows Server 2012

No

WS2012

See KB 2878635

24 Dec 13

KB 2894485: Cross-page memory read or write operation crashes virtual machine that is running on a 64-bit Windows 8-based or Windows Server 2012-based Hyper-V host

Yes

W8

WS2012

Hotfix

23 Dec 13

KB 2878635 Update is available that improves the resiliency of the cloud service provider in Windows Server 2012: December 2013

Yes

 

WS2012

Replaces:

2870270

2869923

2908415

10 Dec 13

KB 2894032: Clustered virtual machine cannot access LUNs over a Synthetic Fibre Channel after you perform live migration on Windows Server 2012-based Hyper-V hosts

Yes, if you run in a Virtual Fibre Channel environment

WS2012

 Hotfix

29 Nov 13

KB 2838043: Can't access a resource that is hosted on a Windows 8 or Windows Server 2012-based failover cluster

Yes. Not directly Hyper-V related, but updates a number of Failover Clustering-related binaries

W8

WS2012

Hotfix

30 Sep 13

KB 2853952: Loss of consistency with IDE-attached virtual hard disks when a Hyper-V host server experiences an unplanned restart

Yes

WS2012

Hotfix

21 Aug 13

KB 2779768: Windows 8 and Windows Server 2012 cumulative update: December 2012

Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues including:

W8

WS2012

WU

WSUS

Catalog

DL Center

16 Aug 13

KB 2855336:  Windows RT, Windows 8, and Windows Server 2012 update rollup: July 2013

Yes, this update rollup package includes performance and reliability improvements

W8

WS2012

WU

WSUS

Catalog

DL Center

13 Aug 13

KB 2803748: Failover Cluster Management snap-in crashes after you install update 2750149 on a Windows Server 2012-based failover cluster

Yes, if KB 2750149 is installed (KB 2750149 is available via Windows Update)

WS2012

WU

WSUS

Catalog

DL Center

 

Fixes:

2750149

12 Jul 13

KB 2822241: Windows 8 and Windows Server 2012 cumulative update: April 2013

 

 

Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues

W8

WS2012

WU

WSUS

Catalog

DL Center

 

Replaces:

2823516

9 Jul 13

KB2770917: Windows 8 and Windows Server 2012 update rollup: November 2012

Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues.

 

Updates IC Components!

6.2.9200.16433 (2008 and later guests)

 

6.2.9200.16384 (2003 and XP guests)

 

W8

WS2012

WU

WSUS

Catalog

DL Center

 

Replaces:

2777166

2758246

2780342

2771821

2771744

2778171

2780523

9 Jul 13

KB 2854362: Vmms.exe processes freeze on certain nodes in a Windows Server 2012-based Hyper-V failover cluster

 Yes, if Hyper-V hosts are clustered and virtual machines are stored on scale out fileserver.

WS2012

Hotfix

9 Jul 13

KB 2840681: Computer does not shut down after you remove a virtual switch in Windows Server 2012

Yes, if using Virtual Machine Queue (VMQ) with a network team

WS2012

Hotfix

9 Jul 13

KB 2851998: "The last backup did not complete successfully" error message when you back up a Windows 8 system

 

Yes. Not directly Hyper-V related, but updates the Volume Shadow Copy Service volume snapshot driver, which could improve backup reliability

W8

WS2012

Hotfix,

DL Center

5 Jul 13

KB 2836988: Windows 8 and Windows Server 2012 update rollup: May 2013

 

Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues

W8

WS2012

WU

WSUS

Catalog

DL Center

13 Jun 13

KB 2844296: Shared Nothing Live Migration fails when you try to migrate a virtual machine to a destination server in Windows Server 2012

Yes, install on all Hyper-V hosts using Shared Nothing Live Migration

WS2012

Hotfix

12 Jun 13

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

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

WS2012

Hotfix

 

Related:

2840565

12 Jun 13

KB 2832478: Virtual machines crash or take a long time to complete the shutdown process on a Windows Server 2012-based host computer

Yes. Prevents an issue that can cause a long shutdown process and/or a virtual machine crash

WS2012

Hotfix

12 Jun 13

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

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

WS2012

Hotfix

11 Jun 13

KB 2845533: Windows RT, Windows 8, and Windows Server 2012 update rollup: June 2013

Yes. Not directly Hyper-V related, but updates the Volume Shadow Copy Service binaries, which could improve backup reliability.

W8

WS2012

WU

WSUS

Catalog

DL Center

15 May 13

KB 2836402: You cannot add VHD files to Hyper-V virtual machines in Windows Server 2012

 

Yes, to correct an issue that could prevent the addition of VHDs to virtual machines under special circumstances

WS2012

Hotfix

31 May 13

KB 2811660: Windows 8 and Windows Server 2012 update rollup: March 2013

 

 

Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of issues

W8

WS2012

WU

WSUS

Catalog

DL Center

 

Replaces:

2815769

2800088

2812829

2823233

29 May 13

KB 2795944: Windows 8 and Windows Server 2012 update rollup: February 2013

 

Yes, includes a number of storage-related (MPIO, NTFS) and network-related fixes

W8

WS2012

WU

WSUS

Catalog

DL Center

24 May 13

KB 2806542: "0x000000D1" Stop error on a virtual machine in Windows Server 2012

Yes, this fix prevents a crash that sometimes happens when using an SR-IOV network adapter

WS2012

Hotfix

24 May 13

KB 2809117: Add-TargetPortToMaskingSet PowerShell command fails in Windows Server 2012

 

Yes, but this update applies to Windows Server 2012 file servers / storage servers supporting a Hyper-V environment

WS2012

Hotfix

24 May 13

KB 2807654: "0x000000C2" Stop error when you try to back up a data deduplication-enabled volume in Windows 8 or Windows Server 2012

 

Yes, install on all Hyper-V hosts and supporting storage servers to prevent a crash during backup when using a deduplication-enabled volume

W8

WS2012

 

Hotfix

Catalog

15 May 13

KB 2825135: You cannot perform an online backup operation by using Windows Server Backup in Windows Server 2012

Yes, if using Windows Azure Online Backup

WS2012

Hotfix

15 May 13

KB 2823956: You cannot connect to a database stored in Windows Azure SQL Database in Windows Server 2012 (sic)

Yes, if using a Windows Azure SQL Database with virtual machines running on Windows Server 2012

WS2012

Hotfix

Catalog

6 May 13

KB 2756872: Windows 8 Client and Windows Server 2012 General Availability Update Rollup

Yes, install on all Hyper-V hosts and supporting storage servers. Fixes a number of networking-related issues in Windows Server 2012 RTM

W8

WS2012

WU

WSUS

Catalog

DL Center

9 Apr 13

KB 2823958: Virtual switch extension cannot send packets separately through every individual network adapter in Windows Server 2012

Yes, if using virtual switch extensions with the intention of sending packets through every network adapter

WS2012

Hotfix

9 Apr 13

KB 2823643: Virtual machines freeze at the "Stopping" state after you shut down the virtual machines in Windows Server 2012

Yes if clustering VMs with high network load

WS2012

Hotfix

13 Mar 13

KB 2795531: You cannot log on to a virtual machine that is running Windows 8 or Windows Server 2012 in a VDI environment

 

Yes, if using Hyper-V in a VDI or Remote Desktop Virtualization Host scenario with Windows 8 or Windows Server 2012 as virtual machines

WS20122

Hotfix

31 Jan 13

KB 2770440: Poor performance when you enable RemoteFX in Hyper-V on a Windows Server 2012-based computer that uses AMD processors

Yes, if hosting a VDI platform on Hyper-V and using AMD processors

WS2012

Hotfix

9 Jan 13

KB 2785638: You cannot use the Cisco SR-IOV network adapter on a virtual machine in Windows Server 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

WS2012

Hotfix

 

 

 

 

 

http://support.microsoft.com/kb/2905249