Our QVS server is licensed for 130 user CALs. Approximately 115 exist on the server. This morning, all of the 115 existing user CALs were gone. There appears to be no record in Event Viewer on the Windows server of anyone logging in, so I don't know how anyone could have manually deleted these.
Is there a way to track what could have possibly happened to these CALs? I've checked the logs which are referenced under 'Logging' in the QVS Console, but I haven't found anything pertaining to the removal of these CALs.
We had this same problem. Turns out whenever server 8.5 would start using PF and using more memory then the physical server had the cal's would be erased. We've since upgraded and haven't had the issue again.