This article describes the hotfixes that are currently available for Windows Server 2012 R2-based failover clusters and highly recommended to be installed on each server of a failover clusters. Failover Cluster Management enables multiple servers to provide a high availability of server roles. Failover Cluster Management is frequently used for file services, virtual machines, database applications, and mail applications.
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The process for installing service packs and hotfixes for Windows Server 2012 R2 differs from the process for earlier versions of Windows Server. In Windows Server 2012 R2, you can use the Cluster-Aware Updating (CAU) feature. CAU automates the software-updating process on clustered servers and maintains availability. For more information, see Cluster-Aware Updating Overview.
For information about how to manually drain cluster nodes for maintenance, see Draining Nodes for Planned Maintenance with Windows Server 2012.
The following Microsoft Knowledge Base articles describe the currently available fixes that are highly recommended to be installed on all failover clusters. Most of the updates apply to computers that are running Windows Server 2012 R2. Some updates, such as KB 976424
, may be needed on computers that are running Windows Server 2008 R2 or Windows Server 2008 if those operating systems are present in the environment.
These updates are considered to be important to install to ensure the highest level of reliability.
Windows Server 2012 R2
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|Date that update was added||Related Knowledge Base article||Title||Component||Why we recommend this update|
|December 18, 2014||3013769
||December 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2||Multiple ||An update rollup package that resolves issues and includes performance and reliability improvements. Available from Windows Update and for individual download from Download Center. To apply this update, you must first install the update 2919355
on Windows Server 2012 R2. |
|November 18, 2014||3000850
||November 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 ||Multiple ||A cumulative update that includes the security updates and nonsecurity updates including Failover Clustering updates that were released between April 2014 and November 2014. Available from Windows Update and for individual download from Download Center. To apply this update, you must first install the update 2919355
on Windows Server 2012 R2. |
|April 8, 2014||2919355
||Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014||Multiple||A cumulative update that includes the security updates and nonsecurity updates including Failover Clustering updates that were released before March 2014. Available from Windows Update and for individual download from Download Center. |
|Dec. 18, 2013||976424
||Error code when the kpasswd protocol fails after you perform an authoritative restore: "KDC_ERROR_S_PRINCIPAL_UNKNOWN"||KDCSVC||Enables you to add a Windows Server 2012 failover cluster. Install on every domain controller that is running Windows Server 2008 Service Pack 2 (SP2) or Windows Server 2008 R2. Otherwise, Create Cluster may fail when you try to set the password for the cluster computer object, and you receive a "CreateClusterNameCOIfNotExists (6783): Unable to set password on <ClusterName$>" error message. This hotfix is included in Windows Server 2008 R2 Service Pack 1 (SP1).|
For more information about the recommended hotfixes and updates for Windows Server 2012-based Hyper-V servers and Windows Server 2012-based Failover Clusters, see:
Recommended hotfixes and updates for Windows Server 2012-based Failover Clusters