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ERROR_DBG_ATTACH_PROCESS_FAILURE_LOCKDOWN
The numeric result becomes useful only when tied to the exact operation and object state. The application process existed, but target policy prevented the debugger from attaching to it.
Where the result is produced
The debugger-lockdown family reports policy enforcement. The protected target, debugging entitlement, and host policy matter more than debugger command syntax.
Create, attach, connect, and start-server failures are separate boundaries. A successful network connection does not prove that process creation or attach authorization is permitted. Keep ERROR_DBG_ATTACH_PROCESS_FAILURE_LOCKDOWN, its numeric value, and the first returning operation together.
Evidence to preserve
| Capture | Diagnostic value |
|---|---|
| Process ID, package identity, process protection state, debugger identity, and attach transport. | Identifies the concrete object and operation associated with attach to a process on a locked-down ARM target. |
| Windows build, device model, boot/development mode, and the first debugger facility event. | Separates argument or lifecycle state from the provider beneath attach to a process on a locked-down ARM target. |
| Client and target timestamps plus transport trace without source code or secrets. | Creates a stable before-and-after comparison. |
| Comparison with an approved development target using the same debugger version. | Shows whether this condition is the first result or a translated summary. |
Preserve comparison with an approved development target using the same debugger version while evaluating this condition before reinstalling, rebooting, clearing state, or substituting another device or provider.
A controlled diagnostic sequence
- Create the process through the approved debug workflow and compare attach authorization. Repeat the original supported operation so the check remains tied to the same API boundary.
- Change only the device development/lockdown state in a controlled lab target. Keep unrelated inputs fixed so the changed result remains attributable to the tested variable.
- Capture the earliest target-side refusal before changing firewall, package, or process state. Record the first returned status and any state transition observed.
Correction and proof
Targeted correction. Use a signed/authorized debugger and a development-unlocked target; do not repeatedly terminate the application to bypass attach policy.
Acceptance criterion. An authorized attach succeeds to the intended process while unauthorized attach attempts remain blocked.
Technical references
References for ERROR_DBG_ATTACH_PROCESS_FAILURE_LOCKDOWN on the deployed platform version.
- Microsoft Open Specifications: HRESULT values — defines the status namespace used.
- Microsoft: HRESULT facility extraction — documents the API or lifecycle behind this condition.
- Microsoft: Windows Device Portal overview — provides ABI, implementation, or protocol context.
- Microsoft: PLMDebug — supports the portability and verification limits.
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