What does HRESULT 0x87C51049 (UTC_E_FILTER_VERSION_MISMATCH) mean?

UTC_E_FILTER_VERSION_MISMATCH

Identify the owning component: filter-language version negotiation

UTC_E_FILTER_VERSION_MISMATCH (0x87C51049) is a Universal Telemetry Client result from the scenario filter parser and evaluator 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 filter-language version negotiation: the scenario requests a filter version incompatible with the evaluator available on this client for this HRESULT. This is narrower than a generic failure of Connected User Experiences and Telemetry for this HRESULT.

What to capture before retrying

The AllStat message names the immediate condition as “Requested filter version is incompatible with available version” 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. Export the relevant Microsoft-Windows-UniversalTelemetryClient/Operational events and preserve their ActivityId or request correlation alongside this result.
2. Capture requested/available versions, scenario schema, package build, command set and load events for this HRESULT. Do this before restarting the service or deleting any working directory for this HRESULT.
3. Perform this one-variable comparison: export the filter for the target client version and compare normalized expressions for this HRESULT.
4. After the comparison, record the next HRESULT and whether the requested session, action, trigger or output object was actually created for this HRESULT.

The most informative neighbor is UTC_E_SCENARIODEF_SCHEMAVERSION_MISMATCH. The distinction is concrete: UTC_E_SCENARIODEF_SCHEMAVERSION_MISMATCH concerns the outer scenario XML schema 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.

Typed-filter note

Save the filter after variable substitution and type inference, not only the authoring XML for this HRESULT. With this result, a visually plausible expression can still fail because the runtime command table, scope or operand types differ from the authoring tool for this HRESULT. Test with one synthetic event whose fields and types are known exactly for this HRESULT.

Confirm the repair

Ship a compatible configuration or feature-gate version-specific commands 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 filter-language version negotiation
• the nearby condition remains distinguishable: UTC_E_SCENARIODEF_SCHEMAVERSION_MISMATCH concerns the outer scenario XML schema

Technical references

• Microsoft Open Specifications: Windows error-code registry — reference for scenario filter parser and evaluator while interpreting it.
• Microsoft: Universal Telemetry Client configuration diagnosis
• Microsoft: Windows Event Log query schema
• Microsoft: Querying Windows Event Log

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