HRESULT 0xC00E001B (MQ_ERROR_IO_TIMEOUT): meaning and diagnosis

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The timeout passed to MQReceiveMessage expired before a message became available.

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MQ_ERROR_IO_TIMEOUT

MQ_ERROR_IO_TIMEOUT means that the timeout for MQReceiveMessage expired before the requested message became available. It is often an expected result of a bounded wait and does not by itself prove that the queue manager or network has failed.

How to handle it

Review the dwTimeout value: 0 polls, a positive value bounds the wait, and INFINITE waits indefinitely.
Keep timeout handling separate from permanent errors such as an invalid handle or unavailable service.
For workers that must stop promptly, combine finite waits with a controlled cancellation or shutdown path.

Microsoft: MQReceiveMessage

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