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User sessions may be logged off unexpectedly when duplicate IP addresses are detected in Windows Multipoint Server 2011

Windows Multipoint Server 2011 uses Remote Desktop IP Virtualization to assign a unique IP address for each user upon logon. If DHCP cannot provide a unique IP address within the time frame that is allocated for the request, there is no retry mechanism, and a non-unique IP address is assigned to the session. Therefore, duplicate IP addresses may be detected. When this occurs, user sessions may be logged off unexpectedly. 

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 2011 installed on Windows Server 2008 R2 Service Pack 1 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.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductMilestoneService branch
    6.1.7601.22xxxWindows Server 2008 R2SP1LDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
This hotfix also adds the following:
  • An optional retry mechanism to the IP Virtualization DHCP lease acquisition.
  • An optional mechanism to force the user to log off if a unique IP address cannot be obtained.

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
File nameAmd64_microsoft-windows-t..-tsappsrv-component_31bf3856ad364e35_6.1.7601.22314_none_cd83f631223cd2dd.manifest
File versionNot applicable
File size16,167
Date (UTC)02-May-2013
Time (UTC)17:56
PlatformNot applicable

Article ID: 2823176 - Last Review: 06/12/2013 23:37:00 - Revision: 1.0

Windows Server 2008 R2 Service Pack 1

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