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This security update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:
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 KB4462941. |
This update is now available for installation through WSUS. 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 4457143.
Keywords: windows 8.1, windows server 2012 r2