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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 contract boundary
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 the numeric value, declared return type, and first returning operation together with This result; the same integer can belong to a different status namespace in another API.
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 This result 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 It 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. Record the first returned status and any state transition observed.
Adjacent outcomes
| Observed comparison | Next conclusion to test |
|---|---|
| The first control changes the result | Concentrate on the variable isolated by this check: Connect to the same server from the approved management host while keeping the target unchanged. |
| The second comparison reproduces the same first status | Preserve lower-layer provider, driver, service, or runtime evidence before editing application data. The second controlled check was: Change only the device development/lockdown state in a controlled lab target. |
| A different status appears after the bounded change | The operation moved to another boundary after the third controlled check. That check was: Capture the earliest target-side refusal before changing firewall, package, or process state. Retain both results and interpret the replacement through its own API contract. |
A defensible resolution
Targeted correction. Repair pairing, trust, routing, or the approved remote-debug channel instead of opening a generic listener. For This result modify only the object, argument, policy, provider, or lifecycle state identified by the collected evidence.
Acceptance criterion. The authenticated client connects to the expected server endpoint and unpaired clients remain unable to establish a session. Re-run the original operation that produced This result under its original identity and supported configuration, then keep one negative control that still produces the expected neighboring outcome.
Technical references
References for This result on the deployed platform version.
- Microsoft Open Specifications: HRESULT values — defines the status namespace used.
- Microsoft: HRESULT facility extraction — documents the API or lifecycle boundary 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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