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| The Function of Terminal Server CALs in Windows Server 2003 |
CALS in Windows Server 2003 are different from CALs in Microsoft Windows 2000. Windows 2000 only uses Device CALs. These CALs are tied to a device. Windows Server 2003 uses Device CALs, and it also uses a new client access license, User CALs. Device CALs in Windows Server 2003 function the same way that Device CALs in Windows 2000 do. User CALs, however, permit access to software by an individual user, instead of by a device.
User CALs allow customers more flexibility when they use Terminal Server in their environments. If a user logs on to more than one client computer, they use one User CAL. The User CAL is not stored in the registry on the client computer the way that a Device CAL is.
User CALs can only be installed on a Windows Server 2003 Terminal Server Licensing server. User CALs cannot be issued to Windows 2000 terminal servers or to clients that access Windows 2000 terminal servers. If the network contains Windows 2000 terminal servers, the Windows Server 2003 Licensing server also has to contain Device CALs, not just User CALs.
Customers do not need a Device CAL and a User CAL to access a terminal server. The terminal server is set in the Terminal Services Configuration tool under Server settings\Licensing as to which type of CAL it will accept. You can set this to Per Device or Per User. This setting can be changed without requiring a restart of the terminal server. One terminal server cannot accept User CALs and Device CALs at the same time.
If the Terminal Server is in Per Device mode and your Licensing server only contains User CALs, you are only issued temporary licenses. When these temporary licenses are close to expiration, you see the following message in a pop-up window:
Your terminal services temporary client license will expire in N days. Please contact your system administrator to get a permanent license.
This message also appears in the application event log as:
Event Type: Information Event
Source: Application Popup
Event ID: 26
Description:
Application popup: Terminal Services
Warning : Your terminal services temporary client license will expire in N days. Please contact your system administrator to get a permanent license.
To correct this problem, switch the terminal server to Per User mode.
Currently, Window Server 2003 does not manage User CALs. This means that even though there is a User CAL in the license server database, the User CAL will not be decremented when it is used. This does not remove administrators from End User License Agreement (EULA) requirements to have a valid terminal server (TS) CAL for each user. Failure to have a User CAL for each user, if Device CALs are not being used, is a violation of the EULA. In the future, this behavior will be changed and User CALs will be managed.
The following text is from the End User License Agreement (EULA) for Windows Server 2003:
Two different TS CALs are available to you: "Device" and "User." Each TS Device CAL permits one Device (used by any User) to conduct Windows Sessions on any of your Servers. Each TS User CAL permits one User (using any Device) to conduct Windows Sessions on any of your Servers. You may use a mix of TS Device CALs and TS User CALs simultaneously with the Server Software in your environment. You can have a Terminal Server request Per User licenses or Per Device (default) but not both simultaneously.
REFERENCES
For additional information about Windows Server 2003 Terminal Server Licensing, visit the following Microsoft Web site:
http://www.microsoft.com/WindowsServer2003/techinfo/overview/termservlic.mspx
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