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WU_E_SIH_UNEXPECTED
WU_E_SIH_UNEXPECTED is the catch-all result for a Server-Initiated Healing failure with no more specific WU_E_SIH_* classification. The useful cause is normally recorded earlier in the SIH task or update log.
Best next step
- Correlate the SIH task completion event with the matching Windows Update log timestamp.
- Look for the first specific download, validation, staging, or post-reboot error before this result.
- Keep the integrity checks active while investigating; the generic code is not a reason to disable self-healing or trust validation.
Microsoft: SIH client diagnostic event fields
Microsoft: Get-WindowsUpdateLog
Microsoft: Windows Update error reference
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