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| WU_E_METADATA_XML_FRAGMENTSIGNING_MISSING | WU_E_METADATA_XML_MODE_INVALID |
WU_E_METADATA_XML_MODE_MISSING
WU_E_METADATA_XML_MODE_MISSING means the configuration omitted the mode that tells Windows Update how metadata verification must be enforced. Without it, the client cannot determine the intended security policy.
What to check
- Verify the source metadata configuration or the update-publishing workflow that generated it.
- Check whether a proxy, content filter, or incomplete synchronization could have truncated the configuration response.
- Capture the exact update source and time of the request before making server-side changes.
Microsoft: Windows Update security
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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