easy:SetOpt_KRBLevel -- set FTP kerberos security level
Pass a string as parameter. Set the kerberos security level for FTP; this also
enables kerberos awareness. This is a string that should match one of the
following: 'clear', 'safe', 'confidential' or 'private'. If the
string is set but doesn't match one of these, 'private' will be used. Set the
string to Nil to disable kerberos support for FTP.