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This security update includes improvements and fixes that were a part of update KB4343891 (released August 30, 2018) and addresses the following issues:
For more information about the resolved security vulnerabilities, see the Security Update Guide.
| Symptom | Workaround |
| All Guest Virtual Machines running Unicast NLB fail to respond to NLB requests after the Virtual Machines restart. | This issue is resolved in KB4457133. |
This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.
File information
For a list of files provided in this update, download the file information for update 4457129.
Keywords: windows server 2012 r2, windows 8.1