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UTC_E_FILTER_INVALID_FUNCTION
Read this as a lifecycle result: filter function lookup
When UTC_E_FILTER_INVALID_FUNCTION (0x87C51050) is returned, the producing layer is scenario filter parser and evaluator for this HRESULT. Treat this HRESULT as a state-machine report, not as a generic telemetry outage for this HRESULT. The rejected object or state is filter function lookup, and the specific boundary is that the expression names a function absent from the supported function table for this HRESULT. Later service errors should not replace this first result in the incident record 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.
Diagnostic record
| UTC diagnostic field | Value |
|---|---|
| Owning state or object | filter function lookup |
| Producing layer | scenario filter parser and evaluator |
| Do not confuse with | UTC_E_FILTER_FUNCTION_RESTRICTED means the function exists but is disallowed in this context |
| Decisive evidence | function spelling/case, namespace if any, filter version, argument list and client capability |
| Narrow comparison | replace it with a documented function while preserving operand data |
The AllStat message names the immediate condition as “Filter does not support this function” 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.
Isolate one changing condition
- Freeze the failing scenario package, caller inputs and UTC service lifetime that produced this result.
- Collect the high-value state: function spelling/case, namespace if any, filter version, argument list and client capability for this HRESULT.
- Use a passing control on the same Windows build, then replace it with a documented function while preserving operand data 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_FUNCTION_RESTRICTED. The distinction is concrete: UTC_E_FILTER_FUNCTION_RESTRICTED means the function exists but is disallowed in this context 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.
Operational response
Correct the generated command or target a client version that supports the needed function 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.
Avoid broad registry resets or global service-policy changes until the single-owner comparison has been run for this HRESULT. They can hide the original configuration generation without proving the contract was corrected 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 function lookup
- the nearby condition remains distinguishable: UTC_E_FILTER_FUNCTION_RESTRICTED means the function exists but is disallowed in this context
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 this result.
- Microsoft: Windows Event Log query schema — reference for scenario filter parser and evaluator while interpreting it.
- Microsoft: Querying Windows Event Log
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