Note This issue can occur on nonclustered environments also if there are many authentication requests occurring at the same time. Additionally, an LSASS CPU spike occurs after the failover. When a service such as Exchange server tries to reestablish the Kerberos client session during a cluster failover, it may cause the system to become unresponsive. Note To learn more about the nonsecurity improvements and fixes in this update, see the 'J– KB3172614' section in Windows 8.1 and Windows Server 2012 R2 update history.
Before you install this update, check out the Prerequisites and Restart requirement sections. We recommend that you apply this update rollup as part of your regular maintenance routines. The July 2016 update rollup includes some new improvements and fixes, including the improvements from June 2016 update rollup KB3161606 and May 2016 update rollup KB3156418 for the Windows 8. Windows Server 2012 R2 Datacenter Windows Server 2012 R2 Standard Windows Server 2012 R2 Essentials Windows Server 2012 R2 Foundation Windows 8.1 Enterprise Windows 8.1 Pro Windows 8.1 More.
