HRESULT 0xC1220302 (WDSTPC_E_ALREADY_IN

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Description:

the WDS multicast download is already active.

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WDSTPC_E_ALREADY_COMPLETED	WDSTPC_E_UNKNOWN_ERROR

WDSTPC_E_ALREADY_IN_PROGRESS

WDSTPC_E_ALREADY_IN_PROGRESS is a duplicate-start/session-state error. WdsTransportClientInitializeSession sets up a transfer, while WdsTransportClientStartSession starts it; application wrappers should not perform the start transition more than once for one active session.

Serialize the session start transition

Protect the transition from initialized to in-progress when multiple worker threads can operate on the same handle.
Log the first successful start together with namespace, object name, and server from the transport request.
Use WdsTransportClientQueryStatus to observe an active transfer instead of calling StartSession again.

The client API separates initialization from start specifically, so a convenient retry helper can accidentally duplicate the start after a timeout in application code even though the transfer began. Correlate transport callbacks with the session handle and application request ID. If the same logical download is intentionally restarted, cancel/close the old session according to the client API and create a fresh session rather than overlapping state machines.

InitializeSession lifecycle · StartSession lifecycle · Transport request structure

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