What does HRESULT 0x8004181C (CI_E_LOGON_FAILURE) mean?

CI_E_LOGON_FAILURE

Authentication or logon rights prevent the content-index operation

CI_E_LOGON_FAILURE is HRESULT 0x8004181C. Windows documents it as “A logon permission violation caused a failure.”

API stage and meaning

This result belongs to accessing a protected local or remote resource under the indexing identity. Credential validation or required logon privilege fails before the resource can be used.

Failure paths

• Stored credentials are invalid or expired.
• The service account lacks an allowed logon type.
• Domain trust or ticket acquisition fails.
• The request crosses a network boundary without usable delegation.

Compare the failing case with a control that preserves account identity without secrets and changes only target resource and logon type; this prevents unrelated environment differences from dominating the test.

Observability checklist

• At step 1, account identity without secrets
• At step 2, target resource and logon type
• At step 3, security audit event and status
• At step 4, domain/controller and ticket context

Capture account identity without secrets before releasing objects, closing handles or reconnecting. Retain the raw HRESULT with target resource and logon type, component version, UTC timestamp and correlation ID.

How to isolate the cause

1. Reproduce under the exact service identity.
2. Inspect security logs for the specific logon failure.
3. Separate authentication from later ACL authorization.
4. Correct account rights through supported policy.

Preserve the component version and target identity, then alter only the condition described as credential validation or required logon privilege fails before the resource can be used.

Remediation policy

Repair credentials, trust or logon rights, then establish a fresh security context. Do not repeatedly submit bad credentials. Record whether accessing a protected local or remote resource under the indexing identity produced any content, update or state transition before returning.

Retry only after a concrete change in account identity without secrets or target resource and logon type.

Wrong conclusions to avoid

It does not prove the authenticated account lacks file ACL permission after logon. Without the call boundary for accessing a protected local or remote resource under the indexing identity, it also cannot identify which wrapper or configuration layer introduced the condition.

Comparison

FILTER_E_ACCESS is a generalized content access result; this HRESULT specifically records logon/authentication failure.

Developer and administrator actions

• Record account identity without secrets with the returned HRESULT.
• In telemetry, correlate target resource and logon type with the target and component generation.
• For regression coverage, force the documented condition: credential validation or required logon privilege fails before the resource can be used.
• For operations staff, expose the corrective state change rather than a generic retry button.
• After remediation, validate one known-good control and the original failing case.

Worked scenario

A remote catalog crawl uses a service account whose password was rotated. Security-event correlation identifies the stale credential.

Official Microsoft references

• Microsoft: content-indexing helper-function values — official contract information relevant to this HRESULT.
• Microsoft: Content-Indexing values
• Microsoft: HRESULT values
• Microsoft: filter handlers in Windows Search