The ADAM store on a Windows Server 2003 R2-based computer always uses the NTLM protocol instead of the Kerberos protocol to perform user proxy authentication

Consider the following scenario. You use user proxy authentication to bind to an Active Directory Application Mode (ADAM) store. This ADAM store resides on a Windows Server 2003 R2-based computer. However, the ADAM store always uses the NTLM protocol for authentication instead of using the Kerberos protocol. This behavior occurs even if the authentication scheme is set to Negotiate. This behavior is a problem if the environment requires the Kerberos protocol for increased security.

During the user proxy authentication process of ADAM, the LogonUser function is called to perform network logon. However, in Windows Server 2003 and in earlier Windows operating systems, the LogonUser function is hardcoded to use the NTLM protocol for authentication.

Hotfix information

A supported hotfix is now 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 this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

Prerequisites

To apply this hotfix, the computer must have the following installed:

�	Windows Server 2003 R2
�	Windows Server 2003 Service Pack 2 For more information, click the following article number to view the article in the Microsoft Knowledge Base: 889100 How to obtain the latest service pack for Windows Server 2003
�	ADAM

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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 2003 R2 with Service Pack 2, x86-based versions

File name	File version	File size	Date	Time	Platform
Adamdsa.dll	1.1.3790.4153	1,632,768	18-Sep-2007	16:41	x86

Windows Server 2003 R2 with Service Pack 2, x64-based versions

File name	File version	File size	Date	Time	Platform
Adamdsa.dll	1.1.3790.4153	2,958,848	18-Sep-2007	14:25	x64

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

ADAM uses bind redirection to authenticate users against the Active Directory directory service. For more information, visit the following Microsoft Web site: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: