Current Windows Server 2012 Updates and Hotfixes
The following are active and current Windows 8 and Windows Server 2012 updates:
| 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) |
More available at https://social.technet.microsoft.com/wiki/contents/articles/15576.hyper-v-update-list-for-windows-server-2012.aspx
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