What does HRESULT 0x800401E9 (MK_E_NOTBOUND) mean?

MK_E_NOTBOUND

Moniker is not bound

Windows defines MK_E_NOTBOUND as 2147746281 (0x800401E9; signed value -2147221015). AllStat’s description is “Moniker is not bound”. The code marks a specific failure: the moniker or object is not currently bound where the operation requires an established binding. The relevant operation is using a relationship or callback state before BindToObject/BindToStorage has completed.

The high bit in 0x800401E9 is set, so this is a failure rather than a success or informational result. Its facility field is 4 (FACILITY_ITF) and its low 16-bit code is 489 (0x01E9). Those bit fields classify the value, but they do not identify the failing object by themselves; the native method, object identity, and first producer of MK_E_NOTBOUND remain essential.

Where it is raised

Understanding MK_E_NOTBOUND requires this subsystem context: A moniker is an object with class-specific parsing, comparison, composition, and binding behavior. For MK_E_NOTBOUND, display-name text alone does not establish what operations a particular moniker implementation supports.

• Associate MK_E_NOTBOUND with one exact operation in IMoniker methods, IBindCtx state, display-name parsing, composite monikers, the Running Object Table, deadlines, and object or storage binding.
• Confirm that MK_E_NOTBOUND came from using a relationship or callback state before BindToObject/BindToStorage has completed, rather than from cleanup or a wrapper that ran afterward.
• Preserve any IErrorInfo, underlying Win32 result, provider message, or callback failure that preceded MK_E_NOTBOUND; the HRESULT alone should not erase a more specific cause.

Telemetry checklist

A useful MK_E_NOTBOUND incident records the moniker class, display name with secrets removed, bind options and deadline, pmkToLeft, requested IID, ROT result, file identity, composite components, and object lifetime registrations in IBindCtx. For MK_E_NOTBOUND, also retain the application and component build, architecture, process and thread IDs, COM apartment, operation correlation ID, elapsed time, and the first state-changing event before the failure. When logging MK_E_NOTBOUND, redact content and credentials while preserving types, lengths, hashes, opaque identities, and lifecycle generations needed to reproduce its contract.

• For MK_E_NOTBOUND, record bind operation ID, completion state, returned object identity, and cancellation.
• For MK_E_NOTBOUND, serialize consumers behind successful bind completion.
• For MK_E_NOTBOUND, check disconnection and object release events.

Why this result is specific

• MK_E_NOTBOUND can result when the caller invokes a follow-up operation after failed or canceled binding.
• MK_E_NOTBOUND can result when a previously bound object was released or disconnected.
• MK_E_NOTBOUND can result when asynchronous code observes the moniker state before binding completion.

Investigation order

1. Capture MK_E_NOTBOUND at the first native return before a wrapper maps it to a generic exception.
2. Identify the exact object, method, and lifecycle phase involved in using a relationship or callback state before BindToObject/BindToStorage has completed.
3. Record bind operation ID, completion state, returned object identity, and cancellation.
4. Serialize consumers behind successful bind completion.
5. Check disconnection and object release events.
6. Reproduce MK_E_NOTBOUND with one controlled input or state change, and verify that the correction changes the decisive evidence rather than merely hiding the result.

Safe handling

Correction. For MK_E_NOTBOUND, perform a fresh successful binding and publish the resulting object atomically to consumers. Retry boundary. Retry is reasonable after a transient bind failure, but never pretend the old unbound state became valid. Before repeating the MK_E_NOTBOUND operation, release partial monikers and bound interfaces, unregister only owned Running Object Table entries, and abandon a bind context whose deadline or parameters no longer match the retry.

Practical scenario

A background link resolver exposes its moniker before BindToObject completes; gating consumers on the future’s successful result removes the race. This isolates MK_E_NOTBOUND within COM moniker parsing, composition, binding, and storage resolution and provides a regression test for the stated correction.

Difference from related HRESULTs

MK_E_NOTBINDABLE rejects the capability to bind; MK_E_NOTBOUND reports missing current binding state. For MK_E_NOTBOUND, keep those outcomes separate in exception mappings, telemetry dimensions, user messages, and automated retry policy.

Developer and administrator guidance

For MK_E_NOTBOUND, preserve the concrete moniker class, compose through IMoniker methods rather than string concatenation, set realistic bind deadlines, and request object versus storage interfaces deliberately. Regression coverage for MK_E_NOTBOUND should include malformed and class-specific display names, absent left-hand context, expired deadlines, unsupported inverse or enumeration operations, unavailable ROT objects, file access, and storage-only targets.

Operational repair for MK_E_NOTBOUND must target the evidence-backed owner: verify the named resource, file, server, or registration identified by the concrete moniker; do not infer a machine-wide COM fault from one provider-specific display name. Retain before-and-after traces for MK_E_NOTBOUND so the change can be attributed and reversed.

References

• Microsoft: generic COM error codes — official Microsoft documentation relevant to MK_E_NOTBOUND.
• Microsoft: HRESULT values — official Microsoft documentation relevant to MK_E_NOTBOUND.
• Microsoft: IMoniker — official Microsoft documentation relevant to MK_E_NOTBOUND.
• Microsoft: IBindCtx — official Microsoft documentation relevant to MK_E_NOTBOUND.
• Microsoft: MkParseDisplayName — official Microsoft documentation relevant to MK_E_NOTBOUND.

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