HRESULT 0xC00E004C (MQ_ERROR_DTC_CONNECT): meaning and diagnosis

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Description:

A connection cannot be established with the Distributed Transaction Coordinator.

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MQ_ERROR_QUEUE_NOT_AVAILABLE	MQ_ERROR_TRANSACTION_IMPORT

MQ_ERROR_DTC_CONNECT

MQ_ERROR_DTC_CONNECT: isolate the owning operation

MQ_ERROR_DTC_CONNECT (0xC00E004C) is not a catch-all media error. It reports that MSMQ could not establish the required transaction connection to MSDTC.

Do not discard these details

Record transaction ID, local/remote DTC endpoint, service states, RPC/network evidence, security settings, and the first MSDTC event.
Preserve the first HRESULT or lower-level result produced before cleanup or automatic retry changes the state.

How to prove the correction

Restore the specific DTC connectivity/security prerequisite and repeat one transactional send/receive without changing queue semantics.

Technical references

MSMQ error codes.
Message Queuing.

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