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ERROR_DBG_START_SERVER_FAILURE_LOCKDOWN
Investigate start a debugger server on a locked-down ARM target at the first returning call, before a wrapper substitutes a generic message. The target policy prevented dbgsrv from being started, before any remote client connection was attempted.
Read the status in context
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_START_SERVER_FAILURE_LOCKDOWN, its numeric value, and the first returning operation together.
Diagnostic facts
| Capture | Diagnostic value |
|---|---|
| Server binary/version, service or package identity, launch account, target mode, and start event. | Identifies the concrete object and operation associated with start 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_START_SERVER_FAILURE_LOCKDOWN preserve windows build, device model, boot/development mode, and the first debugger facility event in an investigation of 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.
Verification path
- Verify whether a preinstalled approved server can be started through Device Portal or the documented service path.
- Change only the device development/lockdown state in a controlled lab target. Treat a changed result as a separate failure rather than automatic resolution.
- Capture the earliest target-side refusal before changing firewall, package, or process state. Repeat the original supported operation so the check remains tied to the same API boundary.
Closing the incident
Targeted correction. Enable the supported development/debug mode or provision the approved server package; do not sideload an arbitrary privileged listener.
Acceptance criterion. The approved server starts, advertises the intended endpoint, stops cleanly, and production mode restores the original restriction.
Technical references
References for ERROR_DBG_START_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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