| Previous | Next |
| ERROR_ONLY_IF_CONNECTED | ERROR_BAD_USER_PROFILE |
ERROR_OVERRIDE_NOCHANGES
The Group Policy extension must run despite an unchanged GPO list.
ERROR_OVERRIDE_NOCHANGES is Win32 value 1252 (0x4E4). It is a documented control return from a Group Policy client-side extension. When the framework reports no changes to the applicable Group Policy Object list, an extension can return this value to ensure that it is called again instead of being skipped by the no-change optimization.
Why an extension can need this override
- the extension manages state outside the GPO list that may have changed independently
- previous processing was incomplete and requires another reconciliation pass
- locally generated data must be repaired even though policy links are unchanged
- the extension must verify removal or drift in resources it owns
- a policy setting is time-sensitive or depends on changing machine conditions
Interpretation for framework and extension authors
This value should not be logged as a generic policy failure. It tells the Group Policy framework to preserve invocation behavior. The extension still needs to return a meaningful final result for the work it performs. A framework wrapper that converts every nonzero status into failure can suppress required processing or produce false error telemetry.
Evidence to collect
Record whether the refresh was user or computer policy, foreground or background, synchronous or asynchronous, and whether the framework indicated that the GPO list changed. Include the extension identifier, policy generation or sequence number, prior processing result, and reason the extension requested an override. Avoid logging full policy data that may contain sensitive paths or account information.
Implementation guidance
Return 1252 only from the documented extension callback and only when the extension truly needs to run on unchanged policy. Do not use it as a general retry signal. Keep reconciliation idempotent because the extension may execute repeatedly with identical policy input. Persist enough state to distinguish a required repair from an endless no-op loop.
Administrators investigating frequent refresh work should identify which extension returns the override and whether it is correcting drift or repeatedly failing to converge. Performance problems should be fixed in that extension rather than by disabling policy refresh globally.
Difference from synchronous refresh requests
ERROR_SYNC_FOREGROUND_REFRESH_REQUIRED asks the framework to perform the extension during a later synchronous foreground refresh. ERROR_OVERRIDE_NOCHANGES instead overrides the “nothing changed” shortcut so the extension is still invoked.
Example
A client-side extension creates managed local files and stores hashes from the last policy application. The GPO list is unchanged, but one file was deleted locally. The extension returns 1252 so the framework invokes it, then the extension detects and restores the missing file without requiring an administrator to edit the GPO.
References
- Microsoft: System Error Codes (1000–1299)
- Microsoft: PFNPROCESSGROUPPOLICY callback
- Microsoft: PFNPROCESSGROUPPOLICYEX callback
Looking for a different code? Search another status or error code.