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| WEP_E_UNEXPECTED_FAIL | E_SYNCENGINE_FILE_SIZE_OVER_LIMIT |
WEP_E_BUFFER_TOO_LARGE
WEP_E_BUFFER_TOO_LARGE — 0x88010009
WEP_E_BUFFER_TOO_LARGE means that lockout metadata supplied to the provider exceeds the size accepted by the Windows encryption-provider contract.
Operational meaning
Windows Encryption Provider integration has separate gates for provider licensing, hardware readiness, volume support, provisioning, active protection, device-lock configuration, and EAS compliance. WEPHOSTSVC events should therefore be read alongside the third-party provider’s own inventory and logs, not as a replacement for them.
This is a contract-size failure, not evidence that the machine lacks memory.
Build the incident record
- Exact metadata byte count, encoding, structure version, and producer
- Provider documented maximum and Windows/plugin versions
- Growth source such as duplicated records, certificates, or serialized recovery data
- Size before/after compression or transformation without logging secrets
Tests that separate the causes
- Generate boundary-size nonsecret metadata just below and above the limit.
- Remove duplicate optional fields while preserving semantics.
- Validate size before crossing the WEPHOSTSVC boundary.
Repair without losing evidence
Apply the smallest change that addresses the first rejected condition: Bound the serialized metadata, remove duplication, and use the documented provider format/version instead of truncating opaque security data.
Close the incident only when maximum-size valid metadata round-trips correctly, oversize input is rejected before state change, and no recovery information is lost.
Technical references
Use these sources for the formal contract, then combine them with evidence from the returning application or service for this condition:
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