From Microsofts Terminal Services FAQ
http://www.microsoft.com/windowsserver2003/community/centers/termin
al/terminal_faq.mspx
Q. How do I configure Terminal Services Licensing servers for
redundancy or high availability?
A. The recommended method to configure Terminal Services Licensing
servers for high availability is to install at least two Terminal
Services Licensing servers with available Terminal Services CALs.
Each server will then advertise in Active Directory as enterprise
license servers with regard to the following Lightweight Directory
Access Protocol (LDAP):
//CN=TS-Enterprise-License-Server,CN=site
name,CN=sites,CN=configuration-container
Each Terminal Services Licensing server should contain 50 percent
of your CALs for load balancing within your environment. If a
Terminal Services Licensing server does not have valid CALs, then
that Terminal Services Licensing server will attempt to refer to
other Terminal Services Licensing servers with valid CALs for
license issuance. (This applies to both enterprise license servers
and domain license servers.)
Please review the License Issuance matrix to see all possible high-
availability scenarios concerning temporary and permanent license
issuance.
http://www.microsoft.com/windowsserver2003/community/centers/termin
al/tsfaq_matrix.mspx
Each client will begin a license request and upgrade 7 days before
the license expiration date. This should allow sufficient time to
address any issues with individual Terminal Services Licensing
servers. If all Terminal Services Licensing servers are down at the
same time, new clients or clients with expired licenses will be
denied access. In addition, Terminal Services Licensing servers
should be separated by network subnets to ensure that a network
outage does not prevent users from connecting to a Terminal
Services Licensing server.
Finally, administrators should use the Terminal Server Licensing
Tool to ensure that at least 10 percent of their CALs are available
on each licensing server. Conversely, if available licenses are
limited to a single licensing server that suffers an outage,
clients with expired licenses will be denied access immediately,
and clients with licenses expiring within 7 days will be denied
access as they meet their expiration dates.
_________________________________________________________
Vera Noest
MCSE, CCEA, Microsoft MVP - Terminal Server
TS troubleshooting:
http://ts.veranoest.net
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