Validation port remains open in virtual switch after the associated virtual machine fails over to another node in Windows Server 2012

Gilt für: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard Mehr

Symptoms


Consider the following scenarios. 

Scenario 1

  • You have the Hyper-V server role installed on a Windows Server 2012-based multiple-node failover cluster.
  • You create a clustered virtual machine that uses Server Message Block (SMB)-based storage on a node (node A).
  • Node A crashes or restarts. Then, the virtual machine on node A fails over to another node (node B).
In this scenario, the validation port that is associated with the virtual machine remains open in the virtual switch on node A.

Note This issue continues to occur even after you delete the virtual machine from node B.

Scenario 2

  • You have the Hyper-V server role installed on a Windows Server 2012-based multiple-node failover cluster.
  • You create a clustered virtual machine that uses SMB-based storage on a node (node A).
  • The cluster service stops on node A. Then, the virtual machine on node A fails over to another node (node B).

In this scenario, the validation port that is associated with the virtual machine remains open in the virtual switch on node A.

Note When an invalid validation port remains open in the virtual switch, this may not cause any observable problems for administrators or for users. However, if many virtual machines are deleted over time, lots of invalid validation ports remain open in the virtual switch. In this situation, the virtual switch may run out of available ports and therefore reach its capacity limit. This behavior may prevent an administrator from creating new virtual machines to be hosted by the cluster nodes.

For more information about validation ports, go to the following Microsoft website:

Cause


This issue occurs because the Hyper-V Virtual Machine Management service (VMMS) cannot delete the validation port after the virtual machine is deleted.

Resolution


This hotfix is also available at Microsoft Update Catalog.

Hotfix information

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 be running Windows Server 2012.

Registry information

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

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


Workaround


To work around the issue, delete and re-create the virtual switch on the affected node to remove the validation port.

Status


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

More Information


For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates