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MQ_ERROR_MACHINE_EXISTS
MQ_ERROR_MACHINE_EXISTS: follow the state transition
For MQ_ERROR_MACHINE_EXISTS, the failed transition is: an MSMQ machine object already exists for the identity being created.
Capture before retry
record machine GUID/name, AD object DN, existing MSMQ configuration object, domain, and creation request.
Prove the fix at the owning API
Reuse or deliberately repair the existing machine object instead of creating a duplicate identity. Compare the existing AD DS/MSMQ object GUID, machine name, and local MSMQ installation identity before deciding the object is stale. After a reimage or rename, verify whether the directory object belongs to the current installation or to an earlier machine incarnation. Keep unrelated inputs unchanged so a changed result has diagnostic value.
Technical references
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