Method of operation of an intelligent transpartent gateway during an ftp session

A method of utilizing an intelligent transparent application gateway between a private and a public network during a file transfer protocol (ftp) session, the private network serving at least one client and the public network including at least one ftp server, comprising the steps of:

• binding a proxy application to a local socket;
• commanding, by the proxy application, a dynamic port-redirect from port number twenty-one to the local socket;
• receiving from a client a request to connect to port number twenty-one;
• redirecting the request to the local socket;
• and
• servicing the request by the proxy application.

A method of communicating between a client and an ftp server through a gateway, comprising the steps of:

• commanding a dynamic port-redirect within the gateway from port number twenty-one to a second port, the second port being bound to a proxy application;
• receiving an ftp get file request directed to port number twenty-one of the ftp server;
• performing a kernel-mode dynamic address translation in accordance with the commanded dynamic port-redirect to direct the ftp get file request to the proxy application;
• invoking an application programming interface to open an ftp data channel within the kernel-mode to handle the ftp server response to the ftp get file request;
• and
• forwarding the ftp get file request to the ftp server.