This article describes a hotfix for Kerberos authentication that must be installed on Windows Server 2008 R2-based and Windows Server 2008-based global catalogs.
Currently, Kerberos authentication enables a user to log on to a domain-joined computer by using user credentials in one of the following formats:
For example, when you try to use the "NetBIOS domain name\username" format to log on as a user in a child domain in a trusted forest on a computer that is running Windows 8 Customer Preview, the authentication process fails. However, you can use the "NetBIOS domain name\username" format for user accounts in the forest root domain of the trusted forest.
This issue affects applications that use Kerberos service for user (S4U) extensions to create a context for a user in a trusted forest. For example, consider the following scenario:
Currently, Kerberos authentication enables a user to log on to a domain-joined computer by using user credentials in one of the following formats:
- User principal name (UPN)
- FQDN domain name\username
- NetBIOS domain name\username
For example, when you try to use the "NetBIOS domain name\username" format to log on as a user in a child domain in a trusted forest on a computer that is running Windows 8 Customer Preview, the authentication process fails. However, you can use the "NetBIOS domain name\username" format for user accounts in the forest root domain of the trusted forest.
This issue affects applications that use Kerberos service for user (S4U) extensions to create a context for a user in a trusted forest. For example, consider the following scenario:
- A user has an application that uses a Kerberos S4U extension on a server in forest A.
- The user is in the child domain of trusted forest B.
- The Kerberos S4U extension is invoked to pass the NetBIOS name of the child domain in forest B.