Critical Description
It would be extremely helpful to be able to force the data channel to use SSL when in "implicit SSL" mode.
When using implicit SSL, some FTP clients do not send a PROT command to change the data channel protection level yet they assume that the data channel will be encrypted.
FtpServer assumes that the data channel will be un-encrypted. It would be nice to have an option to force the data channel to be encrypted to accommodate these clients.