What does HRESULT 0x80042706 (VDS_E_TARGET_SPECIFIC_NOT_SUPPORTED) mean?

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Description:

The iSCSI initiator cannot store a different CHAP shared secret for this specific target.

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VDS_E_SECURITY_INCOMPLETELY_SET	VDS_E_INITIATOR_SPECIFIC_NOT_SUPPORTED

VDS_E_TARGET_SPECIFIC_NOT_SUPPORTED

This HRESULT is a capability boundary in the initiator secret model. IVdsServiceIscsi::SetInitiatorSharedSecret accepts a target ID so an initiator implementation can associate different CHAP secrets with different targets, but Microsoft documents that target-specific support cannot be queried in advance.

Why this state matters

The documented fallback is precise: if this status is returned, call the method again with GUID_NULL for the target ID to set the initiator default secret. Microsoft also states that its iSCSI Software Initiator does not support target-specific initiator secrets. That is different from target-side CHAP configuration and from remembering a target secret for one-way CHAP.

Diagnostic focus

Determine whether the application is setting the initiator secret or the target secret; the two directions of CHAP configuration are separate.
On this HRESULT, use the documented GUID_NULL fallback only if a machine-wide/default initiator secret is acceptable for the deployment.
Do not log the secret bytes while diagnosing the capability failure; record only target ID, operation, and status.
Review mutual-CHAP assumptions because replacing a target-specific secret with a default changes which targets may share initiator credentials.

Technical references

IVdsServiceIscsi::SetInitiatorSharedSecret · VDS_ISCSI_SHARED_SECRET · IVdsServiceIscsi::RememberTargetSharedSecret · RFC 1994: CHAP · RFC 7143: iSCSI

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