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UTC_E_FILTER_ILLEGAL_EVAL
Locate the rejected contract: filter comparison evaluator
UTC_E_FILTER_ILLEGAL_EVAL (0x87C51053) is a Universal Telemetry Client result from the scenario filter parser and evaluator layer for this HRESULT. The symbolic name points to a narrow UTC contract that can be tested directly for this HRESULT. Here the relevant owner is filter comparison evaluator: two operands reached evaluation but their types have no legal comparison or operation for this HRESULT. This is narrower than a generic failure of Connected User Experiences and Telemetry for this HRESULT.
UTC filters are typed programs, not plain text searches for this HRESULT. Parsing, command validation, name lookup, signature binding and evaluation are distinct phases for this HRESULT. Capturing the normalized expression and inferred operand types is essential for a useful diagnosis 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.
Capture checklist
| UTC diagnostic field | Value |
|---|---|
| Producing layer | scenario filter parser and evaluator |
| Owning state or object | filter comparison evaluator |
| Decisive evidence | operator, left/right values and inferred types, conversions, null state and event field origins |
| Narrow comparison | convert one operand to the intended common type and replay the same event |
| Do not confuse with | UTC_E_FILTER_INVALID_FUNCTION_PARAMS is function-call binding rather than binary evaluation |
The AllStat message names the immediate condition as “Filter types can not be compared to each other” 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.
Comparison with a passing case
- Freeze the failing scenario package, caller inputs and UTC service lifetime that produced this result.
- Collect the high-value state: operator, left/right values and inferred types, conversions, null state and event field origins for this HRESULT.
- Use a passing control on the same Windows build, then convert one operand to the intended common type and replay the same event for this HRESULT.
- Repeat once after normal teardown to prove the result is not caused by a stale handle or leftover run state for this HRESULT.
The most informative neighbor is UTC_E_FILTER_INVALID_FUNCTION_PARAMS. The distinction is concrete: UTC_E_FILTER_INVALID_FUNCTION_PARAMS is function-call binding rather than binary evaluation 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.
Resolution and regression test
Make type compatibility explicit in the filter and reject malformed producer data earlier 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 comparison evaluator
- the nearby condition remains distinguishable: UTC_E_FILTER_INVALID_FUNCTION_PARAMS is function-call binding rather than binary evaluation
Technical references
- Microsoft Open Specifications: Windows error-code registry — reference for scenario filter parser and evaluator while interpreting this result.
- Microsoft: Universal Telemetry Client configuration diagnosis — reference for scenario filter parser and evaluator while interpreting it.
- Microsoft: Windows Event Log query schema
- Microsoft: Querying Windows Event Log
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