What does HRESULT 0x87C5102D (UTC_E_EXCLUSIVITY_NOT_AVAILABLE) mean?

UTC_E_EXCLUSIVITY_NOT_AVAILABLE

Identify the owning component: exclusive trace resource

UTC_E_EXCLUSIVITY_NOT_AVAILABLE (0x87C5102D) is a Universal Telemetry Client result from the ETW trace-session control layer for this HRESULT. This result becomes useful only after it is tied to one request generation for this HRESULT. Here the relevant owner is exclusive trace resource: a profile marked exclusive could not start because a higher-priority trace already owns the exclusive resource for this HRESULT. This is narrower than a generic failure of Connected User Experiences and Telemetry for this HRESULT.

The Universal Telemetry Client controls ETW sessions on behalf of diagnostic scenarios for this HRESULT. ETW sessions have controller-owned names, in-memory buffers, providers, logging modes and lifetimes; a status at this layer should be correlated with the actual session list rather than inferred from the presence of an ETL file for this HRESULT. Record the configuration package or scenario generation together with the Windows build; otherwise a repaired file can be tested against a stale in-memory graph and appear to fail for the same reason for this HRESULT.

What to capture before retrying

The AllStat message names the immediate condition as “The trace profile could not be started because it requires exclusivity and another higher priority trace is already running” for this HRESULT. In practice, the useful extension is to ask whether the request was rejected before any side effect, after partial setup, or during cleanup for this HRESULT. Verify the existence and ownership of the expected output—session, directory, process, result object or emitted event—rather than assuming the message describes the final system state for this HRESULT.

Prove the boundary

1. Associate this result with one request, one scenario version and one service process ID for this HRESULT.
2. Save requested/active profiles, priorities, exclusivity scopes, session GUIDs and controller identities and the first lower-level HRESULT if one exists for this HRESULT.
3. Change no policy, provider set or destination except for this test: stop the owner normally or run a nonexclusive test profile with the same providers for this HRESULT.
4. Compare the produced artifacts and operational events, not only the top-level return Value.

The most informative neighbor is UTC_E_ALTERNATIVE_TRACE_CANNOT_PREEMPT. The distinction is concrete: UTC_E_ALTERNATIVE_TRACE_CANNOT_PREEMPT occurs during alternative-trace replacement logic for this HRESULT. Keeping both symbolic names in logs prevents a broad “DiagTrack error” bucket from hiding whether the failure occurred during parsing, authorization, resource acquisition, execution or teardown for this HRESULT.

Trace-session note

Use an ETW controller view to list session name, GUID, mode, buffers and enabled providers while this result is active. The presence of an ETL file from an earlier run is not proof that the required in-memory session currently exists or is owned by UTC for this HRESULT.

Confirm the repair

Schedule captures or redesign provider sharing; do not terminate arbitrary kernel loggers for this HRESULT. Apply that change only to the owning boundary for this HRESULT. A successful repair must make the controlled case cross this boundary while retaining the intended policy, trace providers, destination and security context for this HRESULT.

Restarting Windows, clearing every ETL file or disabling diagnostic policy is not a justified first response to this result. Those actions destroy evidence and can change several independent UTC gates at once for this HRESULT.

• the same request now produces its documented success or nonfatal status without a second hidden retry
• the operational log shows one coherent request lifetime and no orphaned action, timer, process or trace session
• teardown followed by a second run does not reuse stale state or recreate exclusive trace resource
• the nearby condition remains distinguishable: UTC_E_ALTERNATIVE_TRACE_CANNOT_PREEMPT occurs during alternative-trace replacement logic

Technical references

• Microsoft Open Specifications: Windows error-code registry — reference for ETW trace-session control while interpreting it.
• Microsoft: Universal Telemetry Client configuration diagnosis
• Microsoft: Event Tracing for Windows
• Microsoft: WPR and ETW sessions

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