NTSTATUS 0xC0350012 (STATUS_HV_INVALID_CONNECTION

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Description:

The supplied Hyper-V connection identifier does not identify a valid inter-partition connection.

Could be also:
Constant	Type	OS
ERROR_HV_INVALID_CONNECTION_ID	HRESULT	Windows

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STATUS_HV_INVALID_PORT_ID	STATUS_HV_INSUFFICIENT_BUFFERS

STATUS_HV_INVALID_CONNECTION_ID

The connection handle cannot be resolved before message delivery

STATUS_HV_INVALID_CONNECTION_ID means the supplied connection identifier is not valid for the hypervisor operation. In the message-posting path, Hyper-V uses the connection to locate a destination port; no message can be queued until that resolution succeeds.

Keep this separate from STATUS_HV_INVALID_PORT_ID. A connection can be invalid because it was never created, was deleted, belongs to a different context, or is stale; an invalid port status says a connection resolved but its destination is unusable for the operation.

What to verify

Connection creation result, owner, ID lifetime and deletion event.
The destination port and partition recorded when the connection was created.
Whether a reconnect path retains IDs from a previous endpoint instance.
Synchronization between sender teardown and outstanding message submissions.

References

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