To ensure that data is exchanged with the right server when using an SFTP/FTPS connection, the server transmits a cryptographic fingerprint or its public host key prior to establishing a connection.

 When the first connection is established, this key is yet unknown to the Z-FTPcopy program and has to be confirmed by the user before the first data transfer. If you have connected to an FTP server at least once and you are sure that this is the right server, you should save the fingerprint/key information. This enables Z-FTPcopy to automatically verify the fingerprint of the server at each new connection to ensure that no intruder is in the connection between the client and the server.

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