Snapshot contents are not accessible when Server for NFS has handle signing enabled

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Storage Server 2012 R2


Consider the following scenario:
  • You have a server that is running Windows Server 2012 R2 or Windows Server 2012.
  • You have the "Server for NFS role" service installed.
  • The NFS share that is provisioned by the server for NFS is backed by a volume that has snapshots available on it.
  • You try to use an NFS client to navigate the NFS share that is exported by the "Server for NFS role" service.
In this scenario, you cannot browse the snapshot share.


Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this update in Windows Server 2012 R2, you must first have update 2919355 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix. However, you must restart the NFS service. To do this, use the following commands:

nfsadmin server stop 
nfsadmin server start 

Hotfix replacement information

This hotfix does not replace any previously released hotfix.


To temporarily work around this problem, you can choose to disable handle signing. To do this, set the HandleSigningEnabled parameter to 0 (zero) as described in Performance Tuning Guidelines for Windows Server 2012 R2.

Note This is a temporary workaround and not a recommended best practice because it has potential security implications.


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.