"The process cannot access the file" error when you open files from NFS server in Windows Server 2008 R2 SP1

Applies to: Windows Server 2008 R2 Service Pack 1Windows Server 2008 R2 DatacenterWindows Server 2008 R2 Enterprise More

Symptoms


Consider the following scenario:
  • You have two nodes on a cluster that is running Windows Server 2008 R2 Service Pack 1 (SP1).
  • You install Microsoft Services for Network File System (NFS).
  • The NFS service fails over and then fails back to the owner node.
In this scenario, the file access is denied from the NFS server, and you receive the error message that resembles the following:

The process cannot access the file because it is being used by another process

Hotfix information

Important Do not install a language pack after you install this hotfix. If you do, the language-specific changes in the hotfix will not be applied, and you will have to reinstall the hotfix. For more information, see Add language packs to Windows.

A supported hotfix is available from Microsoft. 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 this specific problem.

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, submit a request to 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, visit 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.


Prerequisites

To apply this hotfix, you must install Service Pack 1 for Windows Server 2008 R2.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

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

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

Status


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

Cause


This issue occurs because the msnfsflt driver is not attached to the shared volume after the NFS service failed over.

References


See the terminology that Microsoft uses to describe software updates.