Hyper-V Server 2008 R2: Important Hotfixes and Updates
The following list may help you review whether your Windows Server 2008 R2 and/or Hyper-V Server 2008 R2 is up to date:
| KB Article and Date Published | Required? | IC Version | Applies to: | Availability |
| KB974598: “You receive a “Stop 0x0000007E” error on the first restart after you enable Hyper-V on a Windows Server 2008 R2-based computer” (http://support.microsoft.com/kb/974598  )Published on 10/1/2009 |
Yes, if you encounter this error and your server uses a “C-state” (lower power state) that is supported by the processor, but is not supported by Hyper-V. | N/A | Windows Server 2008 R2 | Hotfix |
| KB974909: “The network connection of a running Hyper-V virtual machine is lost under heavy outgoing network traffic on a Windows Server 2008 R2-based computer” (http://support.microsoft.com/kb/974909 )Published on 10/21/2009 |
Yes | N/A | Windows Server 2008 R2 | Hotfix |
| KB975354: “A Hyper-V update rollup package is available for a computer that is running Windows Server 2008 R2” (http://support.microsoft.com/kb/975354 )Published on 10/21/2009 |
Yes, if you are running a backup or restore solution. | 6.1.7600.20542 | Windows Server 2008 R2 | Hotfix |
| KB975530: “Stop error message on an Intel Xeon 5500 series processor-based computer that is running Windows Server 2008 R2 and that has the Hyper-V role installed: “0x00000101 – CLOCK_WATCHDOG_TIMEOUT” (http://support.microsoft.com/kb/975530 )Published on 11/20/2009 |
Yes, if you are running Hyper-V on the affected hardware. | N/A | Windows Server 2008 R2 | Download Center, Hotfix |
| KB974672: “Virtual machines stop responding (hang) during startup and the Vmms.exe process crashes on a Windows Server 2008 R2 computer that has the Hyper-V role installed“ (http://support.microsoft.com/kb/974672 )Published on 10/14/2009 |
No | N/A | Windows Server 2008 R2 | Hotfix |
| KB977894: “MS10-010: Vulnerability in Windows Server 2008 Hyper-V could allow denial of service” (http://support.microsoft.com/kb/977894 )Published on 2/9/2010 |
Yes | N/A | Windows Server 2008, Windows Server 2008 SP2, Windows Server 2008 R2 | Security Bulletin |
| KB980856: “Stop error in Windows Server 2008 R2: “0x000000CA PNP_DETECTED_FATAL_ERROR”” (http://support.microsoft.com/kb/980856 )Published on 3/12/2010 |
Yes, if you store VHDs on non-PNP disks. | N/A | Windows Server 2008 R2 | Hotfix |
| KB981618: “The computer stops responding or restarts during the Hyper-V Live Migration process in Windows Server 2008 R2” (relates to AMD Errata 383) (http://support.microsoft.com/kb/981618 )Published on 3/27/2010 |
Yes, if you are running Hyper-V on AMD processors. | N/A | Windows Server 2008 R2 | Hotfix |
| KB981836: “Network connectivity for a Windows Server 2003-based Hyper-V virtual machine is lost temporarily in Windows Server 2008 R2” (http://support.microsoft.com/kb/981836 )Published on 4/28/2010 |
Yes, if the server running Hyper-V has a virtual machine that is running Windows Server 2003. | 6.1.7600.20683 | Windows Server 2008 R2 | Hotfix |
| KB981791: “”STOP: 0x0000001a” error message on a computer that has an Intel Westmere processor together with the Hyper-V role installed on Windows Server 2008 or on Windows Server 2008 R2” (http://support.microsoft.com/kb/981791 ) Published on 5/5/2010 |
Yes, if you are running Hyper-V on Intel Westmere processors. | N/A | Windows Server 2008 R2 | Hotfix |
| KB2133637: “The computer stops responding at startup in Windows Server 2008 R2 if you enable the Hyper-V role and if you have more than 512 GB of RAM”(http://support.microsoft.com/kb/2133637 )Published on 6/17/2010 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 | Hotfix |
| KB2230887: “Hotfix: Hyper-V Dynamic Memory does not work on a Windows Server 2008 Standard Edition or Windows Web Server 2008 virtual machine (VM)”(http://support.microsoft.com/kb/2230887 )Published on 7/5/2010 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 | Hotfix |
| KB2223005: “The network connection is lost on a Hyper-V virtual machine” (http://support.microsoft.com/kb/2223005 )Published on 8/12/2010 |
Yes, if the server running Hyper-V has a virtual machine that is running Windows Server 2003. | 6.1.7600.20778 | Windows Server 2008 R2 | Hotfix |
| KB2264080: “An update rollup package for the Hyper-V role in Windows Server 2008 R2: August 24, 2010” (http://support.microsoft.com/kb/2264080 )Published on 8/24/2010 |
Yes | N/A | Windows Server 2008 R2 | Hotfix |
| KB982210: “Startup time increases or hangs at the logon “Welcome” screen if you frequently backup Hyper-V virtual machines on a Windows Server 2008 R2 system.” (http://support.microsoft.com/kb/982210 )Published on 11/24/2010 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 | Hotfix |
| KB2345316: “MS10-102: Vulnerability in Hyper-V could allow denial of service” (http://support.microsoft.com/kb/2345316 )Published on 12/14/2010 |
Yes | N/A | Windows Server 2008 R2 | Security Bulletin |
| KB2496089: “The Hyper-V Virtual Machine Management service stops responding intermittently when the service is stopped in Windows Server 2008 R2” (http://support.microsoft.com/kb/2496089 )Published on 2/23/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 | Hotfix |
| KB2485986: “An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2” (http://support.microsoft.com/kb/2485986 )Published on 2/24/2011 |
Yes | N/A | Windows Server 2008 R2 | Hotfix |
| KB976932: “Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2” (http://support.microsoft.com/kb/976932 )Published on 3/15/2011 |
Yes | 6.1.7601.17514 | Windows Server 2008 R2 | Download Center |
| KB2519946: “Timeout Detection and Recovery (TDR) randomly occurs in a virtual machine that uses the RemoteFX feature in Windows Server 2008 R2”(http://support.microsoft.com/kb/2519946 )Published on 3/23/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2263829: “The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1” (http://support.microsoft.com/kb/2263829 )Published on 4/5/2011 |
Yes | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2517374: “You cannot start virtual machines on a computer that is running Windows Server 2008 R2 and on which a CPU is installed that supports the AVX feature” (http://support.microsoft.com/kb/2517374 )Published on 4/5/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2523676: “GPU is not accessed leads to some VMs that use the RemoteFX feature to not start in Windows Server 2008 R2 SP1”(http://support.microsoft.com/kb/2523676 )Published on 4/19/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2534356: “Some CPU cores are parked while other active CPU cores have a heavy workload in Windows Server 2008 R2”(http://support.microsoft.com/kb/2534356 )Published on 4/26/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2521348: “A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to “Offline All”” (http://support.microsoft.com/kb/2521348 )Published on 4/27/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2494016: “Stop error 0x0000007a occurs on a virtual machine that is running on a Windows Server 2008 R2-based failover cluster with a cluster shared volume, and the state of the CSV is switched to redirected access” (http://support.microsoft.com/kb/2494016 )Published on 5/3/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2525835: “MS11-047: Vulnerability in Microsoft Hyper-V could cause denial of service: June 14, 2011”(http://support.microsoft.com/kb/2525835 )Published on 6/14/2011 |
Yes | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Security Bulletin |
| KB2550569: “”0x20001″ Stop error when you start a Linux VM in Windows Server 2008 R2 SP1”(http://support.microsoft.com/kb/2550569 ) Published on 6/26/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2547551: “Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2”(http://support.microsoft.com/kb/2547551 ) Published on 8/11/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2568088: “Virtual machine does not start on a computer that has an AMD CPU that supports the AVX feature and that is running Windows Server 2008 R2”(http://support.microsoft.com/kb/2568088 )Published on 8/16/2011 |
Yes, if you are running Hyper-V on an AMD processor that supports the AVX feature | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2586470: “A saved virtual machine crashes on resume when it hits a debugging breakpoint in Windows Server 2008 R2” (http://support.microsoft.com/kb/2586470 )Published on 10/13/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2614122: “Windows Server 2008 R2-based computer may stop responding when dynamic VHDs that are created on the computer experience high I/O activity” (http://support.microsoft.com/kb/2614122 )Published on 10/13/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2608694: “You cannot operate one or more virtual machines in Windows Server 2008 R2” (http://support.microsoft.com/kb/2608694 ) Published on 10/20/2011 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2636573: “FIX: The guest operating system may crash when you perform a live migration of Hyper-V virtual machines in a Windows Server 2008 R2 environment” (http://support.microsoft.com/kb/2636573 )Published on 1/10/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Download Center, Windows Update |
| KB2662288: “A differencing VHD file that is created by using Microsoft iSCSI Software Target 3.3 becomes corrupted in Windows Server 2008 R2 or in Windows 7” (http://support.microsoft.com/kb/2662288 )Published on 2/16/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2587660: “Memory dump file is generated very slowly on a Hyper-V virtual machine that uses Dynamic Memory when the Maximum RAM setting is over 4 GB in Windows Server 2008 R2” (http://support.microsoft.com/kb/2587660 )Published on 2/16/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2661530: “The whole backup operation fails if one out of several virtual machines on a Hyper-V server cannot be backed up in Windows Server 2008 R2” (http://support.microsoft.com/kb/2661530 )Published on 2/16/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2666703: “You cannot restore a virtual machine that has a semicolon in its name or in its directory path on a Windows Server 2008 R2 SP1-based server” (http://support.microsoft.com/kb/2666703 )Published on 3/14/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2665347: “You cannot connect to a virtual machine by using the Hyper-V Manager MMC snap-in in Windows Server 2008 R2” (http://support.microsoft.com/kb/2665347 )Published on 4/11/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| KB2698672: “Pointer in a Linux guest operating system does not work correctly when you rotate the wheel button on the mouse in Windows Server 2008 R2” (http://support.microsoft.com/kb/2698672 )Published on 5/9/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2668084: “Virtual machine is restored in the Saved state incorrectly on a Hyper-V server that is running Windows Server 2008 R2” (http://support.microsoft.com/kb/2668084 )Published on 5/9/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2711771: “Incorrect available space is displayed in a Linux Hyper-V virtual machine on a Windows Server 2008 R2-based computer” (http://support.microsoft.com/kb/2711771 )Published on 6/13/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2711774: “AltGr key does not work in a Red Hat Linux virtual machine on a Windows Server 2008 R2-based computer” (http://support.microsoft.com/kb/2711774 )Published on 6/13/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| KB2712156: “AVX instructions do not work in a virtual machine on a Windows Server 2008 R2-based computer that has an AMD CPU which supports the AVX feature” (http://support.microsoft.com/kb/2712156 )Published on 10/10/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| 2734056: “Alt Gr key does not work on a Red Hat Linux virtual machine after you install the Hyper-V role on a computer that is running Windows Server 2008 R2” (http://support.microsoft.com/kb/2734056 )Published on 8/15/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2, Windows Server 2008 R2 SP1 | Hotfix |
| 2739143: “Windows 7-based or Windows Server 2008 R2-based computer crashes when you run a guest operating system that has multiple virtual CPUs” (http://support.microsoft.com/kb/2739143 )Published on 9/12/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| 2740390: “Hypervisor does not provide timer services correctly on a Windows 2008 R2-based Hyper-V server” (http://support.microsoft.com/kb/2740390 )Published on 10/10/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| 2744129: “You cannot run a Windows 8-based or Windows Server 2012-based virtual machine in Windows Server 2008 or in Windows Server 2008 R2” (http://support.microsoft.com/kb/2744129 )Published on 10/10/2012 |
Yes | N/A | Windows Server 2008 R2 , Windows Server 2008 R2 SP1 | Download Center, Windows Update |
| 2752183: “You cannot migrate a Hyper-V virtual machine from a non-Bulldozer-based computer to a Bulldozer-based computer in Windows Server 2008 R2” (http://support.microsoft.com/kb/2752183 )Published on 10/10/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| 2755221: “You receive more DHCP logs on a DHCP server than expected after you create a virtual network on a computer that is running Windows Server 2008 R2” (http://support.microsoft.com/kb/2755221 )Published on 10/10/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
| 2740390: “Hypervisor does not provide timer services correctly on a Windows 2008 R2-based Hyper-V server” (http://support.microsoft.com/kb/2740390 )Published on 10/10/2012 |
Yes, if the issue applies to you. | N/A | Windows Server 2008 R2 SP1 | Hotfix |
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