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I am trying to connect to a an ftp through command line using

ftp ftpperso.free.fr

I am then prompted for username and password.

I get this message

230 User username logged in.
Remote system type is UNIX.
Using binary mode to transfer files.

and status confirms that I am connected to the server.

However when I then try any command (ie. ls) the console freezes and nothing happens.

Do you have any idea of what is going on?

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up vote 3 down vote accepted

You are probably behind a NAT, and therefore need to enable passive mode before doing anything.

ftp> passive
Passive mode on.
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I'll try that tonight. What is a NAT by the way? – Alfred M. Nov 13 '12 at 8:46
2  
What is a NAT by the way? @AlfredM, Network Address Translation. It lets you connect multiple devices to your Internet connection without having to give each one a (globally) unique IP address. – Synetech Dec 2 '12 at 1:03

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