In a system we have 8 Operator Clients running and 8 Workplace Licenses for them. From time to time I get a license error from a random client. No other workplace on other machines is running. The error is not static it seems to come only for a few seconds. I've restarted one client, a few seconds after the two Operator WP comes up I've got the licence error message and then it was gone I could it only find in the log file.
This behavior is new since some weeks and I haven't changed configuration or anything.
Could be a "ghost process" running or something else that is not visible in "running workplaces" ?
Every hint is welcome.
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Most likely, you have left a plant explorer or workplace open on some other node, e.g. a server which have tied up the last of your available license seats.
Even plant explorers and engineering workplaces require OPERATOR_WPL when viewing any of the following aspects: alarm list, event list, faceplate and trend.
The annoyance will be seen locally on the node that got "starved" from its "expected" OPERATOR_WPL.
By pressing the Diagnostics button in the License Assignment Editor you will see to what nodes your available OPERATOR_WPL license seats have been allocated.
If you frequently use plant explorers, etc. on servers you might select to buy one additional license seat to allow "one more operator".
You can also deploy a Group Policy that forces idle sessions on non-operator nodes to close (logout) if left unattended for some duration of your choice.
Note: up until 5.1 RevC, workplace sessions run via Remote Desktop Protocol requires REM_OPER_WPL which throws a slightly different error when no REM_OPER_WPL is found in the CLS.
No such feature exists
As of 5.1 RevD and FP4RevD all sessions make use of OPERATOR_WPL.
We have 8 "direct" Clients and 4 remote Clients. And we have 8 Operator Client and 4 Remote Operator Client Licenses. One of the Remote Clients was (for testing purpose) accessed directly and had so consumed the wrong license.
My Thanks to Stefan, I was not aware of that possibility of the license assignment.