The PROT command requested a data protection level that is not supported. The request to set the level is rejected.
The support by the FTP server for these levels is determined by the value specified on the SECURE_DATACONN statement in the FTP.DATA file for the server. SECURE_DATACONN specifies the minimum level of security allowed for the data connection.
PROT C is rejected if SECURE_DATACONN has a value of SAFE or PRIVATE.
PROT S is rejected if SECURE_DATACONN has a value of PRIVATE or NEVER. Also, it is rejected if the security mechanism is TLS.
PROT P is rejected if SECURE_DATACONN has a value of NEVER.
PROT E is always rejected.
FTP continues.
None.
None.