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SDIAG_E_NOVERIFIER
The important question is not merely what the text says, but which contract was being evaluated. At this boundary, a troubleshooting pack declares a root cause/resolution flow that requires verification but provides no usable verifier.
Meaning in the subsystem
A troubleshooting pack has distinct initialization, detection, resolution, and verification phases. Keep the ordinary result report together with the debug report, and identify whether the pack script, PowerShell host, managed host, resource loader, trust check, or verifier produced the first failure.
Do not collapse this result into a nearby status. A resolver reporting success is not equivalent to an independent verifier confirming the state change. Compare lifecycle, identity, caller, and first API.
Minimum useful evidence
| Preserve before changing state | Diagnostic value |
|---|---|
| Manifest root-cause and resolution definitions | Creates a stable before/after control. |
| Verifier script/resource identifiers and files included in the signed pack | Tests whether the first boundary moves. |
| Pack build output, catalog contents, and post-build modifications | Pins evidence to one attempt. |
| Which resolution path attempts verification | Separates contract failure from environment. |
Collect the smallest evidence set that identifies the attempt and object. Redact secrets and message contents; preserve hashes, IDs, policy values, versions, and state transitions instead.
Isolate the responsible condition
- Inspect the packaged manifest and catalog rather than source directories; keep every other input fixed and record the first event that differs from the failing run.
- Add a minimal verifier that observes the corrected state without reapplying it; use a disposable or backed-up environment when the comparison changes boot, security, device, queue, or encryption state.
- Run detect/resolve/verify on both present and absent root-cause cases; retain one negative control so that a broad workaround is not mistaken for a root-cause correction.
If the failure disappears after a broad restart, treat that as a clue about lifetime or state, not as proof of repair. Reproduce the original missing troubleshooting verifier operation with targeted instrumentation before closing the incident.
Avoid the common misdiagnosis
The following decision points keep the investigation tied to the returning operation:
| Observed result | Interpretation |
|---|---|
| The minimal or known-good comparison succeeds | The control works; inspect production-specific state. |
| The control fails at the same first operation | The control also fails; inspect host/provider evidence. |
| A new HRESULT marks another boundary | The failure moved to another boundary; diagnose the new status separately rather than treating it as confirmation that the entire operation is fixed. |
Regression proof
The corrective action should be narrow: Include and sign the required verifier, reference it correctly in the manifest, and keep verification read-only where possible. Preserve the pre-change configuration or trace.
Close the incident only when the verifier distinguishes fixed, not fixed, and not found outcomes and survives pack extraction/deployment. Repeat under the original identity and state. A different environment is comparison, not proof.
Technical references
The following documentation is most relevant when checking the code against the actual Windows contract for missing troubleshooting verifier:
- Microsoft Open Specifications: HRESULT values.
- Microsoft: Windows Troubleshooting Platform.
- Microsoft: About WTP.
- Microsoft: debugging troubleshooting packs.
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