The client has a permanent CAL that will expire within 7 days, or the CAL has already expired, and needs to be renewed. #WINDOWS SERIAL TERMINAL SERVER UPGRADE#The client has been already issued a temporary CAL, and is in need of a permanent CAL upgrade.The client has never been issued a CAL for the environment, neither temporary nor permanent.Only under the following circumstances will a license server need to be contacted: On the other hand, per-device mode terminal servers do enforce CAL allocation and validation. If a client presents a valid, unexpired CAL to a terminal server upon connection, the terminal server will allow the connection without contacting a license server because the token has been validated by the terminal server itself. License token enforcement is only in effect when your terminal servers are in per-device mode. Per-user mode terminal servers do not allocate CALs to client rather they simply check to see if a valid license server exists on the network and if so, will allow the connection. The only weak link here is in the ability to contact a license server. As long as license servers are available, clients will be able to connect. License server availability is critical for the successful operation of a terminal server environment. However, Microsoft has no built-in mechanisms for providing redundancy for its license servers the terminal services license service is not cluster-aware so you can’t leverage Microsoft Cluster Services (MSCS) for high-availability. To further complicate the situation, there isn’t a lot of information out there on license server high-availability, and Microsoft’s own documentation on the subject is contradictive. One of the most critical components in any terminal server deployment is the license server. If the license server is not available, users may be denied access to resources. This article will discuss a few different avenues to provide resiliency to your terminal services licensing infrastructure, with this part focusing on high availability. #WINDOWS SERIAL TERMINAL SERVER UPDATE#If you would like to be notified when Michael Burke releases Terminal Services License Server High-Availability and Recovery (Part 2), please sign up to our Real time article update newsletter.
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