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| WU_E_METADATA_CERT_MISSING | WU_E_METADATA_INTCERT_BAD_TRANSPORT_ENCODING |
WU_E_METADATA_LEAFCERT_BAD_TRANSPORT_ENCODING
WU_E_METADATA_LEAFCERT_BAD_TRANSPORT_ENCODING means the leaf signing certificate arrived in a malformed transport encoding and could not be decoded for metadata verification.
What to check
- Verify that the update source serves intact certificate metadata and that no intermediary modifies or truncates the response.
- For WSUS or a private catalog, check the catalog-generation and certificate-export pipeline.
- This error is about certificate data format, so adding trust-store entries alone will not repair malformed data.
Microsoft: Windows Update security
Microsoft: Certificates and security for Updates Publisher
Microsoft: Windows Update error reference
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