Topic Last Modified: 2007-10-04

The Microsoft Exchange Server Analyzer Tool queries the Active Directory directory service to find the values returned for the servicePrincipalName attribute of the Exchange server computer accounts for the Exchange resources listed in the table below.

Exchange Resource servicePrincipalName value	Expected Value Returned
exchangeMDB	Fully Qualified Domain Name (FQDN)
exchangeMDB	NetBIOS name
exchangeRFR	Fully Qualified Domain Name (FQDN)
exchangeRFR	NetBIOS name
SMTP	Fully Qualified Domain Name (FQDN)
SMTP	NetBIOS name
SMTPSVC	Fully Qualified Domain Name (FQDN)
SMTPSVC	NetBIOS name
HOST	Fully Qualified Domain Name (FQDN)
HOST	NetBIOS name

If the Exchange Server Analyzer finds that the servicePrincipalName attribute for the computer account of an Exchange resource is missing one of the expected values listed here, the Exchange Server Analyzer displays an error.

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 properly set SPNs.

• Authentication issues between clients that run Microsoft Office Outlook 2003 or later and the Exchange Information Store (mailbox data) may indicate the lack of a valid SPN for the exchangeMDB resource.
  
  
• Outlook 2003 or later clients that have Active Directory authentication issues may indicate the lack of a valid SPN for the exchangeRFR resource.
  
  
• Authentication failures between Simple Mail Transport Protocol (SMTP) virtual servers may indicate the lack of a valid SPN for the SMTPSVC or HOST resource.
  
  

To resolve this issue, follow these steps to add the missing values for the affected attributes.

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" (http://go.microsoft.com/fwlink/?LinkId=28103).

   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, then press Enter.
     
     setspn.exe -a SMTPSVC/ mail.yourdomain.com YOURSERVERNAME
     
     

     Note:
     Replace mail.yourdomain.com with your SMTP virtual server FQDN and YOURSERVERNAME with the name of the Exchange server. There is no space between SMTPSVC/ and mail.yourdomain.com in the command above.

     
     
     

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