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If a server is configured to support AUTH SSL messages, then it MUST include SSL on the list of parameters supported for the AUTH command. FEAT message handling and reply formatting MUST comply with [RFC2389].
If Implicit FTPS is used, then FEAT can only be sent over the encrypted TLS session. This means that feature negotiation cannot be used before the TLS session is negotiated. Hence the AUTH message information included in the FEAT message response has only informational value for the implicit SSL negotiation. This applies primarily to Explicit FTPS.