Network outage and performance degradation after you install WMF 5.1 in Windows Server 2012 R2

Applies to: Windows Server 2012 R2 Standard


Assume that you use a Hyper-V Network Virtualization (HNV) Gateway with Routing and Remote Access Service (RRAS) clusters on a Windows Server 2012 R2-based server. After you install Windows Management Framework (WMF) 5.1 (KB3191564) on the server, you may experience the following decreased Network Address Translation (NAT) and cluster performance issues:

  • The connectivity for tenants is lost.
  • You can't run a failover for a HNV Gateway cluster when a role is in the Offline status.
  • Tenants can't add, delete, or modify VM networks when you run a failover for a Gateway cluster.
  • You can't add, delete, or modify VM NAT and VPN rules.

Note These issues are especially obvious when you use Cloud Platform System (CPS) Premium.


These issues occur because the Get-RemoteAccessConfiguration PowerShell cmdlet fails to return valid data. This causes I/O performance issues. The failure also causes the RRAS configuration of the HNV Gateway to become unsynchronized. A failover may result in a network outage that prevents tenants from managing VM resources. Therefore, you can detect these issues when the following conditions are true:

  • There is no output after you run the Get-RemoteAccessConfiguration PowerShell cmdlet.
  • Thousands of 0-byte files are written to the cluster's shared volume.


To fix this issue, get the stand-alone package for this update 4033587 from the Microsoft Update Catalog website.

More information


To install this update, you must have the April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Learn about the terminology that Microsoft uses to describe software updates.

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Server 2012 R2

Additional file information