HRESULT 0xC00E0009 (MQ_ERROR_SHARING

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Description:

The queue is already open with receive-sharing settings that conflict with the requested access.

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MQ_ERROR_OPERATION_CANCELLED	MQ_ERROR_SERVICE_NOT_AVAILABLE

MQ_ERROR_SHARING_VIOLATION

MQ_ERROR_SHARING_VIOLATION means that another application has opened the queue with receive-sharing settings incompatible with this open request. An exclusive receive open prevents other MSMQ applications from opening the queue for receive access until it is closed.

How to investigate

Check the dwAccess and dwShareMode values supplied to MQOpenQueue.
Identify processes or services that hold a receive handle with MQ_DENY_RECEIVE_SHARE.
Use compatible sharing for competing consumers, or deliberately serialize exclusive receive access.

Microsoft: MQOpenQueue

Diagnostic discriminator: Inspect existing MQOpenQueue receive handles and their sharing mode. This status is produced by an incompatible exclusive/shared receive open, not by queue permissions or a missing queue.

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