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E_FDPAIRING_NOCONNECTION
E_FDPAIRING_NOCONNECTION belongs to Function Discovery and PnP-X device pairing. It marks the pairing workflow could not establish or retain the required device connection. The useful starting point is the exact API, object and state transition that returned 0x8FD00001, because a shell or application message can hide that boundary.
Where this result is raised
Function Discovery separates discovery from association and installation., 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. During a this result investigation, pairing evidence must therefore distinguish host policy, provider state, network reachability, device capacity and user-confirmation outcomes.
When it is returned, discovery can succeed through SSDP, WS-Discovery or another provider while the subsequent control channel fails. During a this result investigation, capture endpoint metadata, network profile, protocol and device liveness separately from authentication.
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.
Evidence worth collecting
- Function-instance identity and XAddr/endpoint. for it, this pins the event to an object or resource generation within the Function Discovery and PnP-X device pairing boundary.
- Discovery protocol and network interface. for it, this places the event on the lifecycle or transaction timeline within the Function Discovery and PnP-X device pairing boundary.
- Connection attempt and lower socket status. for it, this separates caller input from environment and service state within the Function Discovery and PnP-X device pairing boundary.
- Device online state. for it, this creates a stable comparison across retries or another machine within the Function Discovery and PnP-X device pairing boundary.
A controlled diagnostic sequence
During a this result investigation, reduce the case while preserving the condition described by the HRESULT.
- First: Repeat discovery and connection as separate steps.
- Next: Verify the advertised endpoint is reachable from the selected interface.
- Then: Check firewall and network isolation.
- Finally: Retain provider OnError details.
How to interpret comparison tests
| Control | Interpretation | Hold constant |
|---|---|---|
| Same input, fresh object or connection | If the result disappears, retained lifecycle or ownership state is implicated. | While diagnosing this result, keep the original data, account, device, or timeline parameters unchanged. |
| Same object, reduced operation | If the result follows one specific transition, statement, file, or ceremony step, the failure is localized. | While diagnosing it, remove only unrelated work and keep the first failing boundary visible. |
| Same device, controlled host or network | A change separates device-side state from host provider, policy and transport. | While diagnosing it, keep firmware and ceremony type fixed. |
What this code does not justify
AUTHFAILURE means a connection reached an authentication ceremony; NOCONNECTION may fail before credentials are evaluated.
Do not delete drivers or pairing records before proving basic transport.
Verification after correction
Treat it as corrected only when the same discovered instance establishes the required channel and survives one reconnect; retain the original negative case so fallback cannot be mistaken for repair.
Technical references
The references below define the API family or storage/protocol behavior used to interpret it.
- Microsoft Win32 metadata: winerror.h
- Microsoft: IPNPXDeviceAssociation
- Microsoft: IFunctionDiscoveryNotification
- Microsoft: Web Services on Devices overview
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