Error code when an application uses the CredSSP if the authenticated user account is a member of many security groups on a computer that is running Windows Vista or Windows Server 2008: "0x80090329"

Consider the following scenario:

• You run an application that uses the Credential Security Support Provider (CredSSP) to perform user authentication on a computer that is running Windows Server 2008 or Windows Vista.
• The authenticated user account is a member of many security groups.

In this scenario, the authentication may fail and the application returns the 0x80090329 error code.

You frequently encounter this problem in the following scenario:

• You use the Remote Desktop Connection utility on a client computer that is running Windows Server 2008 or Windows Vista to try to log on to a terminal server that is running Windows Server 2008.
• On the terminal server, the Allow connection only from computers running remote desktop with network level authentication option is enabled for the RDP-Tcp connection.
• The user account that you specify in the Remote Desktop Protocol (RDP) client is a member of many security groups.

In this scenario, you cannot start the terminal server session. Additionally, you receive the following error message:

This problem occurs because the CredSSP incorrectly encrypts the data because the size of the security token of the user account exceeds 16 kilobyte (KB).

Hotfix information

To resolve this problem, install this hotfix on the client computer and on the server.
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, visit the following Microsoft Web site: 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the �Hotfix Request� page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, the computer must be running one of the following operating systems:

• Windows Vista Service Pack 1 (SP1)
• Windows Vista Service Pack 2 (SP2)
• Windows Server 2008
• Windows Server 2008 Service Pack 2 (SP2)

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfix.

File information

The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table.

Windows Vista and Windows Server 2008 file information notes

• 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.

  Version	Product	SR_Level	Service branch
  6.0.600 0 . 16xxx	Windows Vista	RTM	GDR
  6.0.600 0 . 20xxx	Windows Vista	RTM	LDR
  6.0.600 1 . 18xxx	Windows Vista and Windows Server 2008	SP1	GDR
  6.0.600 1 . 22xxx	Windows Vista and Windows Server 2008	SP1	LDR
  6.0.600 2 . 18xxx	Windows Vista and Windows Server 2008	SP2	GDR
  6.0.600 2 . 22xxx	Windows Vista and Windows Server 2008	SP2	LDR

• Service Pack 1 is integrated into the original release of Windows Server 2008.
• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

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.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

For all supported Itanium-based versions of Windows Server 2008

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: -

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

Additional files for all supported Itanium-based versions of Windows Server 2008

For more information about the CredSSP, click the following article number to view the article in the Microsoft Knowledge Base:
For more information about the 0x80090329 error code, visit the following Microsoft Web sites:

• http://msdn.microsoft.com/en-us/library/aa380499(VS.85).aspx
• http://msdn.microsoft.com/en-us/library/cc240507(PROT.10).aspx