Terminal Services License Server Discovery
Applies To: Windows Server 2008
When you install the TS Licensing role service, you need to specify a discovery scope, which determines how the Terminal Services license server will be automatically discoverable by terminal servers.
The three discovery scopes are:
Workgroup
Domain
Forest
The recommended discovery scope for a license server is Forest.
Note
In Windows Server 2003, "forest discovery scope" was known as "enterprise scope."
Workgroup discovery scope is only available when the computer on which you are installing the TS Licensing role service is not a member of a domain. If you configure workgroup discovery scope, terminal servers, without additional configuration, can automatically discover a license server in the same workgroup.
Domain discovery scope and forest discovery scope are only available when the computer on which you are installing the TS Licensing role service is a member of a domain.
Note
If the license server is a member of a workgroup, and then you join the license server to an Active Directory domain, the discovery scope for the license server is automatically changed from Workgroup to Domain.
If you configure domain discovery scope, terminal servers, without additional configuration, can automatically discover a license server in the same domain only if the license server is installed on a domain controller. You can install the TS Licensing role service on a non-domain controller, but the license server will not be automatically discoverable by terminal servers in the domain. To configure domain discovery scope, you must be logged on as a domain administrator to the domain in which the license server is a member.
If you configure forest discovery scope, terminal servers, without additional configuration, can automatically discover a license server in the same forest, because the license server is published in Active Directory Domain Services. To configure forest discovery scope, you must be logged on as an enterprise administrator to the forest in which the license server is a member.
Important
To issue TS Per User CALs to users in other domains, the license server must be a member of the Terminal Server License Servers group in those domains, regardless of whether the discovery scope for the license server is Domain or Forest.
In the license server discovery process, a terminal server in a Windows Server-based domain attempts to contact a license server in the following order:
License servers that are specified in the Terminal Services Configuration tool or by using Group Policy
A license server that is installed on the same computer as the terminal server
License servers that are published in Active Directory Domain Services
License servers that are installed on domain controllers in the same domain as the terminal server
Important
To see which license servers the terminal server discovers and to be alerted to possible licensing discovery and configuration issues, use Licensing Diagnosis in Terminal Services Configuration. For more information, see Troubleshooting TS Licensing Installation.
You can change the discovery scope of the license server by using Review Configuration in the TS Licensing Manager tool. For more information, see Troubleshooting TS Licensing Installation.