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WU_E_REDIRECTOR_ID_SMALLER
WU_E_REDIRECTOR_ID_SMALLER means the redirector package received by the client has a lower redirectorId than the copy already cached locally. The client treats that as a possible downgrade or stale response.
What to investigate
- Check whether an upstream proxy or caching layer can serve an older response after the source has changed.
- In a managed environment, confirm that replicas and update-service endpoints are synchronized consistently.
- Do not replace cached Windows Update files manually; first identify why an older redirector response was returned.
Microsoft: Windows Update error reference
Microsoft: Windows Update proxy selection
Microsoft: Windows Update log files
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