The WVS Ops Manager created persistent WVS sessions when curl or Invoke‑WebRequest probes were used on its endpoints.
Those requests did not trigger the instance shutdown timer, causing sessions to remain open and licenses to be reserved. The issue has been addressed, and the behavior is now as expected. 

To benefit from this fix: 

• Update your zenon Software Platform to the latest build of zenon 15 or higher.
• By default, sessions created this way will remain present for 60 seconds. If this timeout should be decreased, add the "InitialConnectionShutdownTimeout" to the [WVS] section in the zenon6.ini to define a custom timespan.