The Active Directory Users and Computers snap-in cannot display service principal names (SPNs) that have non-numeric port values when you configure the Delegation properties of a computer account in Windows Server 2003

Consider the following scenario:

• A Windows Server 2003-based domain has the Windows Server 2003 domain functional level.
• You configure a constrained delegation in the Active Directory Users and Computers MMC snap-in. You select the Trust this computer for delegation to specified services only option.
• You select a user or computer account that has a service principal name (SPN) and a non-numeric value for the port number, such as a named instance.

In this scenario, the SPN is not listed in the Available services list.

Additionally, assume that you try to manually update the msDS-AllowedToDelegateTo attribute by adding the SPN that has the non-numeric port value, and then you edit services in the Services to which this account can present delegated credentials list. However, any SPN that has a non-numeric port value is dropped from the msDS-AllowedToDelegateTo attribute.

This problem occurs because the Active Directory Users and Computers MMC snap-in expects all ports to have numeric values. Therefore, any SPN that has a non-numeric port value is dropped.

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, 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.

Prerequisites

To apply this hotfix, you must have the following installed on the domain controller:

• Windows Server 2003 Service Pack 1 (SP1) or Windows Server 2003 Service Pack 2 (SP2)
  
  For more information, click the following article number to view the article in the Microsoft Knowledge Base:
  889100  (http://support.microsoft.com/kb/889100/ ) How to obtain the latest service pack for Windows Server 2003
• The Active Directory Users and Computers snap-in

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 with Service Pack 1, x86-based versions

Windows Server 2003 with Service Pack 2, x86-based versions

Windows Server 2003 with Service Pack 1, Itanium-based versions

Windows Server 2003 with Service Pack 2, Itanium-based versions

Windows Server 2003 with Service Pack 1, x64-based versions

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

To work around this problem, you must manually add SPNs with non-numeric port values to the msDS-AllowedToDelegateTo attribute.

For more information about how to do this, click the following article number to view the article in the Microsoft Knowledge Base:

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