Windows Server: OS update for Windows Cluster required

[German]Another brief information for administrators of Clusters made of Windows Server 2012 R2, Windows Server 2016. In Windows cluster environments with Windows Server 2012 R2 and Windows Server 2016, there may be issues since the July 2018 patchday.


On Twitter @PhantomofMobile pointed my attention to th this topic. 

Microsoft confirmed some issues with security updates from July 10, 2018 within this blog post (dated August 3, 2018). Some Windows clusters may have issues due to the following updates:

Operating System Impacted update
Windows Server 2016 KB4338814
Windows Server 2012R2 KB4338824, KB 338815

Application crashes occur when they open HTTP or TCP connections, access can be denied, and more (see blog post for details).

For clusters running Windows Server 2016, installing the latest version of the updates should mitigate the problem. If the Patch Orchestration Application (POA) is running in the cluster, it may already have updated the cluster's machines. Please make sure that the updates mentioned above has been updated..


For clusters running Windows Server 2012R2, there is an additional upgrade to the version released in July as Fix. If the cluster nodes were not updated before July 10, you may need to apply the July 10 update first, and then run the Windows update again to fix the problem. Details can be found in the blog post of August 3, 2018.

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