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WU_E_METADATA_TIMESTAMP_TOKEN_SIGNATURE
WU_E_METADATA_TIMESTAMP_TOKEN_SIGNATURE means the timestamp token signature itself could not be validated. This is a direct integrity and authenticity failure for timestamp evidence.
What to do
- Reacquire the metadata from the intended update source rather than reusing copied or cached responses.
- Check whether a proxy or content filter performs transformation or inspection on update-service traffic.
- For private catalogs, review the timestamp-signing certificate and the integrity of the publishing pipeline.
Microsoft: Windows Update security
Microsoft: Authenticode digital signatures
Microsoft: Windows Update error reference
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