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WPN_E_OUT_OF_SESSION
WPN_E_OUT_OF_SESSION is an HRESULT used by the Windows notification platform. It means that the platform has no available presentation-layer session for the requested notification operation.
What to check for WPN_E_OUT_OF_SESSION
- Reduce unnecessary notification churn and ensure notification objects are released when no longer needed.
- Check for application behavior that creates many concurrent notification operations.
- Treat the condition as a resource-pressure signal and retry only after capacity can recover.
Diagnostic interpretation
This result has the HRESULT value 0x803E0200. AllStat records the condition as “The notification platform has run out of presentation layer sessions.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the wpn / out / of / session operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original wpn / out / of / session condition.
Retry and recovery
Treat WPN_E_OUT_OF_SESSION as a checkpoint, not as a request to loop. Retry only after evidence shows that the rejecting state has changed, and verify the same scenario end to end.
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