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SL_E_CHPA_UNKNOWN_PROPERTY_NAME
Where this result is produced
SL_E_CHPA_UNKNOWN_PROPERTY_NAME is HRESULT 0xC004C751. It belongs to the CHPA activation-server workflow. Its narrow boundary is: the product-key property name is not defined by the activation-server schema.
CHPA results describe the activation service’s business-rule and product-key administration workflow. Several codes concern server records and transactions rather than the end user’s local licensing store. The code is not interchangeable with a known property with an invalid value.
Windows reports “The activation server reported that property name specifies unknown property”.
Objects and state transitions
| Stage | Role |
|---|---|
| CHPA input | The server receives a key-management or activation payload with business-rule inputs. |
| Schema and rule evaluation | Key type, properties, bindings and program rules are validated before the operation can commit. |
| Persistent operation | Insert, update, delete or lookup state is part of the producing operation. |
| Server response | The client sees this result after CHPA rejects or cannot persist the requested change. |
Minimum diagnostic record
| Evidence | Question answered |
|---|---|
| activation request ID and CHPA/server timestamp | Which CHPA entity was being inserted, updated, deleted or queried? |
| product-key record identity and key type | Did schema validation finish before persistence was attempted? |
| business-rule name or server operation | Is another transaction using the same product-key record? |
| property name/ID, type, parent record and proposed value hash | Can caller identity and elevation be captured before changing state? |
| Code-specific distinction | Does the evidence support “compare the property name and case with the supported schema and deployment version” rather than a known property with an invalid value? |
How to reproduce the same condition
- Record
0xC004C751, UTC time, caller and the first method or server request that returned it. - Capture business-rule name or server operation.
- Before remediation, confirm that the failure is not instead the neighboring condition: a known property with an invalid value.
REM Evidence context: SL_E_CHPA_UNKNOWN_PROPERTY_NAME
cscript %windir%\system32\slmgr.vbs /dlv
cscript %windir%\system32\slmgr.vbs /atoDo not merge these conditions
| Result | Different condition |
|---|---|
SL_E_CHPA_NULL_VALUE_FOR_PROPERTY_NAME_OR_ID | a product-key property operation supplies a null name or identifier where the server requires identity |
SL_E_CHPA_UNKNOWN_PROPERTY_ID | the numeric or opaque property identifier is not defined by the activation-server schema |
SL_E_CHPA_FAILED_TO_UPDATE_PRODUCTKEY_BINDING | the server found an existing product-key binding but could not commit its updated state |
A focused reproduction for this exact result
| Control | Design |
|---|---|
| Failing fixture | A newer client sends a property name not understood by the server. |
| Single variable | Change only property identity, declared type and supplied value. |
| Positive control | A schema-defined property accepts a value of the declared type. |
| Different result | If the experiment instead proves “a product-key property operation supplies a null name or identifier where the server requires identity”, diagnose that condition separately rather than treating it as this HRESULT. |
Recovery without broad resets
To correct this using supported mechanisms, compare the property name and case with the supported schema and deployment version.
Changes that make this code harder to diagnose
- Avoid launching parallel requests against the same key record.
- Avoid editing server XML or properties without preserving the rejected payload.
- Avoid treating a failed database operation as a client connectivity problem.
Technical references
- Slmgr.vbs options — official reference for the mechanism surrounding this result.
- Plan for volume activation clients.
- Windows activation error help
- MS-ERREF Windows Error Codes
Looking for a different code? Search another status or error code.