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E_FDPAIRING_HWFAILURE
Within Function Discovery and PnP-X device pairing, E_FDPAIRING_HWFAILURE reports that the device reported a hardware-level failure during pairing. Diagnosis of E_FDPAIRING_HWFAILURE should follow the original owner and generation rather than treating the visible symptom as the cause.
Facts that change the diagnosis
| Capture | Diagnostic value |
|---|---|
| Device model and firmware for E_FDPAIRING_HWFAILURE. | For E_FDPAIRING_HWFAILURE, this separates caller input from environment and service state and helps test the Function Discovery and PnP-X device pairing boundary. |
| Device-reported status for E_FDPAIRING_HWFAILURE. | For E_FDPAIRING_HWFAILURE, this provides a stable comparison across retries or another machine and helps test the Function Discovery and PnP-X device pairing boundary. |
| Power/battery state for E_FDPAIRING_HWFAILURE. | For E_FDPAIRING_HWFAILURE, this identifies the exact object or resource generation involved and helps test the Function Discovery and PnP-X device pairing boundary. |
| Same device paired with a controlled host for E_FDPAIRING_HWFAILURE. | For E_FDPAIRING_HWFAILURE, this places the failure on the lifecycle or transaction timeline and helps test the Function Discovery and PnP-X device pairing boundary. |
Subsystem meaning
During a E_FDPAIRING_HWFAILURE investigation, Function Discovery separates discovery from association and installation. For E_FDPAIRING_HWFAILURE, a device can be visible yet reject a connection, complete discovery but fail authentication, lack a usable profile, or depend on a disabled PnP-X bus component. When E_FDPAIRING_HWFAILURE is returned, pairing evidence must therefore distinguish host policy, provider state, network reachability, device capacity and user-confirmation outcomes.
For E_FDPAIRING_HWFAILURE, this status comes from the device side rather than proving a host software defect. When E_FDPAIRING_HWFAILURE is returned, battery, radio, secure element, firmware or device-specific pairing state may prevent the ceremony from completing.
For E_FDPAIRING_HWFAILURE, the first owner to inspect is the discovery provider, pairing handler, association database, network protocol, device ceremony, or PnP-X bus component that returned the HRESULT.
Isolation workflow
When E_FDPAIRING_HWFAILURE is returned, use a disposable control object, repository copy, file, or device association where the subsystem permits it.
- First: Power-cycle only after preserving the device status.
- Next: Check manufacturer diagnostics and firmware.
- Then: Test another known-good device on the host.
- Finally: Avoid repeated ceremonies that can lock the device.
Avoid the tempting broad fix
During a E_FDPAIRING_HWFAILURE investigation, NOCONNECTION is transport; HWFAILURE is an explicit device-side failure after participation.
For E_FDPAIRING_HWFAILURE, do not reinstall all host networking components as the first response.
Expected branches
| Control | Interpretation for E_FDPAIRING_HWFAILURE | Hold constant |
|---|---|---|
| Same input, fresh object or connection | For E_FDPAIRING_HWFAILURE, if the result disappears, retained lifecycle or ownership state is implicated. | While diagnosing E_FDPAIRING_HWFAILURE, keep the original data, account, device, or timeline parameters unchanged. |
| Same object, reduced operation | For E_FDPAIRING_HWFAILURE, if the result follows one specific transition, statement, file, or ceremony step, the failure is localized. | While diagnosing E_FDPAIRING_HWFAILURE, remove only unrelated work and keep the first failing boundary visible. |
| Same device, controlled host or network | For E_FDPAIRING_HWFAILURE, a change separates device-side state from host provider, policy and transport. | While diagnosing E_FDPAIRING_HWFAILURE, keep firmware and ceremony type fixed. |
Regression proof
Verify E_FDPAIRING_HWFAILURE with the original scenario, one boundary case, and one deliberate failure; success means the device passes its own diagnostics and completes pairing on both the original and control host.
Technical references
The references below define the API family or storage/protocol behavior used to interpret E_FDPAIRING_HWFAILURE.
- For
E_FDPAIRING_HWFAILURE: Microsoft Win32 metadata: winerror.h - Microsoft: IPNPXDeviceAssociation
- Microsoft: DeviceInformationKind and association endpoints
- Microsoft: PnP-X architecture
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