Lftp is available to install from the default repositories using the package manager as shown. It features bookmarks, job control, support for the readline library, a built-in mirror command, and support for multiple file transfers in parallel. sftp, fish, torrent) on Unix and like Operating Systems. LFTP is a free and open-source command-line utility designed for several file transfer protocols (e.g. Using Passive Mode: For this method to work, the client must have a configuration like Cubiq's answer.2.The ,14,178 comes from the convertion of octets to decimal ((14*256) + 178). Using Active Mode (considering that machine "A" has IP 175.41.135.142): Right after connection and authentication, issue this command: PORT 175,41,135,142,14,178 You will need to open port 3762 in you firewall.That is why the client must configure his FTP server to use a public IP and a known port ( see Cubiq's answer). This fails when this IP is private and port is not open in client's firewall.Instead, machine "B" informs machine "A" that the result is waiting to be fetched in a given IP and port of machine "B". This time, the result will not be delivered to port N+1 of machine "A".The client then initiates the connection from port N+1 to port P on the server to transfer data. The result of this is that the server then opens a random unprivileged port (P > 1023) and sends P back to the client in response to the PASV command. The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command. When opening an FTP connection, the client opens two random unprivileged ports locally (N > 1023 and N+1). In passive mode FTP, the client initiates both connections to the server, solving the problem of firewalls filtering the incoming data port connection to the client from the server. Even if the IP is public, the ports N+1 must be open in the firewall. This fails because FTP client in machine "A" asks machine "B" to connect to a private IP.Machine "A" sends "ls" to machine "B", but because it is Active Mode, the result of "ls" will be delivered to port N+1 (N>1023) of machine "A".FTP client in machine "A" connects to FTP server in machine "B" on port 21.The server will then connect back to the client's specified data port (.) Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. In active mode FTP, the client connects from a random unprivileged port (N > 1023) to the FTP server's command port, port 21. You will use FTP client to push and pull files from Machine B.There is a firewall in Your Network and possibly in Client's Network.You want to pull files from Machine B that is in Client's Network. You have Machine A in Your Network with an FTP Server and an FTP Client.This is my understanding of your scenario: Logs of clients firewall when we tried to connect with machine "B" as shown in below image. after that we need to put the processed data back on to the client's FTP Server (i.e. Now we need to pull some data from our clients FTP Server (i.e. In this case machine "A" is our FTP Server (which is AWS Ubuntu server) for internal usage, because of the lot of other process and data which is regularly uploaded on this FTP Server (Machine "A") & Machine "B" is our client's FTP Server which they use for their internal purposes. & it's the same issue with Ubuntu & we want to give a elastic IP somewhere in ftp so that it will start working. this point is added just to give you more details. before the solution we used to receive the error & log showed like This problem was also there in windows at that time we solved it by giving a elastic IP to FileZilla.here we can't use that because it does not have GUI & it is going to be used by a php script.we can provide specific IP in FTP using filezilla which it will use while going out of the gateway.port listing goes successful + only directory listing fails. Log shows that we are connected to the FTP server + we are authenticated correctly.Now when we try to connect to XYZ companies ftp server using this AWS server as client, it is sending it's local LAN IP while connecting to the ftp server, because of which listing of directories does not work.
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