The Chilkat FTP2 component provides a PassiveUseHostAddr property to handle problems that may arise when an FTP server is located behind a NAT router. FTP servers respond to the PASV command by sending the IP address and port where it will be listening for the data connection. If the control connection is SSL encrypted, the NAT router is not able to convert from an internal IP address (typically beginning with 192.168) to an external address. The PassiveUseHostAddr property tells the FTP client to discard the IP address part of the PASV response and replace it with the IP address of the already-established control connection.
