Topic Last Modified: 2006-05-12

The Microsoft® Exchange Server Analyzer Tool queries the Active Directory® directory service global catalog server to find the values returned for the Fully Qualified Domain Name (FQDN) and NetBIOS name for the servicePrincipalName attribute of the exchangeAB and HOST resources.

The Exchange Server Analyzer displays an error if either of the following conditions is true:

A Service Principal Name (SPN) is a unique name that identifies an instance of a service and is associated with the logon account under which the service instance runs. Kerberos authentication is not possible for Exchange services without correctly set SPNs.

To resolve this issue, follow these steps to add the missing values for the servicePrincipalName attribute.

Use the SETSPN.exe tool to add an SPN with the missing values
  1. Install the Setspn.exe tool. To obtain the Setspn.exe tool, see "Windows 2000 Resource Kit Tool : Setspn.exe" (

    The Windows Server 2003 version of the Setspn.exe command-line tool is available in the Windows Server 2003 Support Tools that are included on the Windows Server 2003 CD. To install the Server 2003 Support Tools, double-click the Suptools.msi file in the Support/Tools folder.

  2. Follow the guidance in the SETSPN.EXE Setspn_d.txt file to add the missing value to the Active Directory object for your Exchange server. The following example demonstrates adding the FQDN value for a virtual SMTP server SPN:

    • Start a command prompt, and then change to the directory where you installed Setspn.exe.

    • At the command prompt, type the following command:

      setspn.exe-a SMTPSVC/ YOURSERVERNAME

      Replace with your SMTP virtual server FQDN and YOURSERVERNAME with the name of the Exchange server.
      Then press Enter.