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WSA_QOS_TRAFFIC_CTRL_ERROR
RSVP parsing succeeded far enough to reach local packet scheduling
WSA_QOS_TRAFFIC_CTRL_ERROR reports a failure when the Winsock QoS provider converts the generic request into local Traffic Control API state. The requested FLOWSPEC may be syntactically valid, yet installation can still fail because the selected interface, packet scheduler, classifier, memory allocation, or provider implementation cannot realize it.
Separate local enforcement from network signaling by recording whether an RSVP message was sent and whether the error occurred before any remote response. Inspect the interface, sending and receiving directions, installed filters, and traffic-control objects. Recreating the socket rarely fixes a persistent TC configuration or unsupported adapter path. If the provider returns extended status, preserve it because this umbrella code can represent both resource exhaustion and an internal translation failure.
Local traffic-control evidence
- Network interface and flow direction.
- Translated service type and scheduler parameters.
- Classifier filters installed for the socket.
- Underlying TC or provider-specific extended error.
References
- Microsoft: definition of the traffic-control error
- Microsoft: directional QOS structure
- Microsoft: GQOS traffic shaping and filtering mechanisms
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