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Asked: 2026-05-26T19:11:09+00:00

I am making a simple FTP client in Java using standard Java sockets. I

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I am making a simple FTP client in Java using standard Java sockets. I have succeeded to connect to the server. Then I can send FTP commands like: 

USER myUserName
PASS myPassword

and the output says that I am logged in to the server (I allways send the \r\n string with each command that I send to the server). When I send the command “ls” i get this response: 425 No data connection

When I log in to the server from the standard FTP client from the MS Windows terminal I can use the “ls” command and get a list of all files and folders, but it doesn´t work in my Java application.

The FTP command “HELP” also gives different output in my client and in the standard FTP client in MS Windows.

What am I doing wrong?

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1 Answer

  1. Editorial Team

    you need to use PORT or PASV to establish a data connection. The file list doesnt come over the control connection. You will have to read up on ftp. The commands of the ftp command in windows dont correspond 1:1 to the commands in the protocol that you have to use when implementing it yourself.

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