Update is available to set up UDP port routes between cluster nodes

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard


An update for the cluster service is available in Windows Server 2012. After you apply this update, multiple User Datagram Protocol (UDP) ports can be used to set up routes between the cluster nodes. The UDP ports can then be routed through distinct physical routes. Additionally, if one of the routes fails, an alternative route can take over, and cluster communications remain intact.

More Information

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.

Registry information

To enable this hotfix, you must add the following registry subkey:

Registry location:HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\Clussvc\ParametersValue name: NetftPorts
Data Type: REG_SZ
Data Range: 0 - 65535

  • Values should be a single port range list (for example: 3344-3353).
  • Any invalid configuration in this registry will ignore the contents and will continue with normal execution.
  • A default port, such as 3343, is not required to be configured explicitly in the list.
  • An administrator must make sure that the configured ports are not already being used by some other processes.
  • An administrator must make sure that nodes across the cluster are configured consistently.


There is no prerequisites to apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.


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.