FTPSPassiveMode property (FTPS Connection Manager)
Specifies if passive FTP mode should be used for file transfer.
Use this property to specify, whether passive, or active mode should be used for data transfer. In passive mode, if the data connection is needed, the server opens listening socket and accepts data connection to it. If active mode is used, the listening socket is opened by the client side. Using passive mode is reasonable if a client is located behind a firewall or proxy software.