FIX: User sessions are logged off unexpectedly when duplicate IP addresses are detected in Windows Multipoint Server 2012

Applies to: Windows Multipoint Server 2012 Premium


When a duplicate IP address is detected in a Windows Multipoint Server 2012 environment, user sessions are logged off unexpectedly.


This problem may occur because Windows Multipoint Server 2012 uses Remote Desktop IP Virtualization to assign a unique IP address to each user when users log on. If DHCP cannot provide a unique IP address within the time frame that is allocated for the request, Windows Multipoint Server 2012 does not try again to do this. Instead, it assigns a non-unique IP address to the user session. Therefore, you may detect duplicate IP addresses.


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 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.


You must have Windows Multipoint Server 2012 installed on Windows Server 2012 to apply this hotfix.

Restart information

You must restart the computer after you apply this 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.