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ERROR_DBG_CONNECT_SERVER_FAILURE_LOCKDOWN
The actionable meaning of connect to a debugger server on a locked-down ARM target comes from the component that returned it. The client could not establish an authorized session with the existing dbgsrv endpoint on the device.
The relevant contract
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_CONNECT_SERVER_FAILURE_LOCKDOWN, its numeric value, and the first returning operation together.
Capture before changing state
| Capture | Diagnostic value |
|---|---|
| Server endpoint, transport, certificate or pairing identity, target address, and lockdown state. | Identifies the concrete object and operation associated with connect to a debugger server 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 a lower-layer provider failure. |
| 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. |
For ERROR_DBG_CONNECT_SERVER_FAILURE_LOCKDOWN 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 success observed only after such a change is useful comparison data for this HRESULT but it does not identify the original cause.
Focused experiments
- Connect to the same server from the approved management host while keeping the target unchanged. 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.
A defensible resolution
Targeted correction. Repair pairing, trust, routing, or the approved remote-debug channel instead of opening a generic listener.
Acceptance criterion. The authenticated client connects to the expected server endpoint and unpaired clients remain unable to establish a session.
Technical references
References for ERROR_DBG_CONNECT_SERVER_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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