In tip 6332 » How do I select a preferred Windows 2000 Terminal Services license server in a domain or site?, we configured a Windows 2000-based terminal server to access a specific license server.
To configure a Windows Server 2003-based terminal server to access a specific license server:
1. Open a CMD.EXE window on the Windows Server 2003-based terminal server.
2. Type the following command and press Enter, where <LicenseServerName> is the NetBIOS name of the server, or the IP Address of the server, or the FQDN (Fully-Qualified Domain Name) of the server:
REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\TermService\Parameters\LicenseServers\<LicenseServerName>" /F
3. Shutdown and restart the Windows Server 2003-based terminal server.
NOTE: I would also type:
REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\TermService\Parameters" /V DefaultLicenseServer /T REG_SZ /F /D "<NetBIOSLicenseServerName>"
Where <NetBIOSLicenseServerName> is the NetBIOS name of the license server.