Greetings.
I work in an industrial facility, where we have several devices connected via RDS to a VM running Server 2012 R2.
This Monday (7/30/2018) a technician had to cycle power on one of the devices (a thin client) and when it rebooted it would not reconnect as normal. This failure stopped production for nearly three shifts - which is pretty significant.
The Event Log entry said "RDP: No valid license available". I logged on to the server and found that ALL of the licenses in the "Installed RDS Per Device CAL" group were gone - the group was empty - and that all the devices were now showing up in the "Temporary RDS Per Device CAL" group. All the devices licensing in the temporary group were also expired.
After working with MS clearinghouse folks, I was able to figure out how to deactivate and reactivate the license server - and install new licensing - but I am now obligated to tell my management how we can prevent this from happening again.
So, my problem statement is something like: "At some point in early April (or late March", we 'lost' the retail purchase "Installed RDS Per Device CAL" licenses - and so, all the devices switch to temporary licenses. When those temporary licenses expired, we were vulnerable to losing connection - should power be cycled on one of the devices. We did, eventually cycle power on one of the devices - which shut the system down.
So, I am reaching out to Microsoft to help determine why the licenses just "disappeared".
Thank you!!!!