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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 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.
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 This result 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 It 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. Record the first returned status and any state transition observed.
- Change only the device development/lockdown state in a controlled lab target. Treat a changed result as a new boundary 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.
What the result does not prove
| Observed comparison | Next conclusion to test |
|---|---|
| The first control changes the result | Concentrate on the variable isolated by this check: Verify whether a preinstalled approved server can be started through Device Portal or the documented service path. |
| 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. |
Closing the incident
Targeted correction. Enable the supported development/debug mode or provision the approved server package; do not sideload an arbitrary privileged listener. For This result modify only the object, argument, policy, provider, or lifecycle state identified by the collected evidence.
Acceptance criterion. The approved server starts, advertises the intended endpoint, stops cleanly, and production mode restores the original restriction. 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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