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I tried to connect to a different machine with FTP.
I continually get

500 Unable to service PORT commands
ftp: bind: Address already in use

The solution I got was to enable passive mode in my FTP client.
What does it mean, and how do I do it?

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You'll find a lot of existing answers on Google about passive FTP. We can't explain how to configure an FTP client for passive FTP without knowing its name, but AskUbuntu probably isn't the best forum for that answer anyway--the documentation of any FTP client that's worth using will have an explanation. – cqcallaw Mar 31 '12 at 16:36
What ftp client do you use? And is this question linked to Ubuntu in any way? – saji89 Jan 18 '13 at 7:27
This link will help you to understand distinction between active and passive modes of FTP. – saji89 Jan 18 '13 at 7:30
This question appears to be abandoned and unanswered, could you perhaps add more detail to your question? If this question no longer applies then you can either delete it or answer it yourself if you've solved the problem. Thanks! – saji89 Jan 18 '13 at 7:31

If you are using the command-line ftp client, invoke it as pftp or ftp -p instead, which will enable passive mode. If not, find the documentation for your FTP client and search it for "passive mode". This link contains a detailed explanation of passive mode.

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