If a user is on a downlevel client computer that is joined to a Windows Server 2003-based domain that enrolls for certificates from an Enterprise certification authority in the Windows .NET domain, the downlevel client does not correctly display the user principal name (UPN) in the Subject Alternative Name field.
When this field is viewed from the downlevel clients, the field in the issued certificate is displayed as: "No alternative name".
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The certificate has been issued correctly and does have the correct information in the field. Windows 95, Windows 98, Windows Milennium Edition (Me), and previous versions of Windows NT are not able to display this field correctly.
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The Subject Alternative Name extension in the details section of the certificate normally lists the UPN of the account of the user in Active Directory.
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