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 0×80090329 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:

An authentication error has occurred (Code: 0×80090329).