I stumbled upon a *real* weird problem. Apparently the terminal server licenses called “per Device” ain’t a real per device. From reading on it Microsoft states it like this:
Device-based versus User-based Terminal Server CALs
Two types of Terminal Server Client Access Licenses are available: TS Device CAL or TS User CAL.
- A TS Device CAL permits one device (used by any user) to conduct Windows Sessions on any of your servers.
- A TS User CAL permits one user (using any device) to conduct Windows Sessions on any of your servers.
You may choose to use a combination of TS Device CALs and TS User CALs simultaneously with the server software.
If I take the above and take a closer look at my terminal server license server I’ll see something like this:
As you can see, I *do* have devices with more than a single license (in fact, several of them do have more then four), which from my understanding ain’t what Microsoft had in mind.
After noticing this, I initially thought my terminal servers had the wrong license mode, but as you can see below, they are using “per Device“.
Which means, I am completely clueless at this point, as they *really* should be using just a single license, and not multiple ones.
Ok, after experimenting a bit with it, it seems that a license seems to be tied to the SSID. Which would explain, why I see different CAL’s for a single device. We reflashed the thin clients in between (and within that process, the SSID is freshly generated), so that’d be the only explanation I’ve got for what I’m seeing.