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STATUS_CS_ENCRYPTION_EXISTING_ENCRYPTED_FILE
The existing remote file requires the encrypted-file open path
The target already contains EFS-protected data, but the client attempted to open it through a normal remote-file path. The status tells the SMB client to switch to the Client-Side Encryption workflow so encrypted metadata and raw encrypted content are handled correctly.
This is a protocol-mode transition, not evidence that the file is corrupt. The client must preserve file identity and reopen through the expected CSE sequence. Copy tools that ignore the transition can accidentally fail, create a plaintext replacement, or lose EFS metadata.
What to inspect
- Verify that the same remote file is reopened through the CSE path.
- Preserve EFS metadata, alternate streams, and security information during copy.
- Do not replace the encrypted file with a plaintext file merely to bypass the status.
References
- Microsoft: System error codes 6000 through 8199
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: CreateFile and FILE_ATTRIBUTE_OFFLINE
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