What does HRESULT 0x80320019 (FWP_E_NOTIFICATION_DROPPED) mean?

 
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FWP_E_TOO_MANY_CALLOUTS FWP_E_TRAFFIC_MISMATCH

FWP_E_NOTIFICATION_DROPPED

FWP_E_NOTIFICATION_DROPPED means a notification could not be delivered because the recipient message queue was at capacity. It does not by itself mean that a filter action or packet decision was lost; it means the observer missed an event.

What to check

  • Make notification processing faster and avoid blocking work in the consumer path.
  • Treat notifications as potentially lossy and reconcile important state by enumerating WFP objects when needed.
  • Use a bounded capture period when investigating high-rate traffic rather than leaving verbose event collection on indefinitely.
netsh wfp set options netevents=on

Microsoft: netsh wfp

Microsoft: WFP object model

Microsoft: WFP error codes


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