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I am working with a supplier who's just tightened their security. They moved from an anonymous FTP setup to a more secure alternative. The parameters they gave me

Port: 4421
Path: /mailbox
User: (...)
Password: (...)
Auth SSL: yes
Passive mode: yes

Using ftp -pn 4421 allows me to connect but it hangs. I need to specify the "Auth SSL" option in my command line (and script) but how do I do that?

I read the ftp man page of my host and found nothing. I looked at using sftp instead but it seems that the latter does not use passive mode.

My host info Linux 2.6.18-128.el5 x86_64 GNU/Linux

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Which operating system? I would assume *nix, but you never know. – h0tw1r3 Oct 18 '12 at 20:44
OS is x86_64 GNU/Linux. – Chris Oct 18 '12 at 20:45
up vote 2 down vote accepted

Install ftp-ssl or lftp (there are others) for an FTP client with SSL/TLS support.

looked at using sftp instead but it seems that the latter does not use passive mode.

sftp transfers files over encrypted ssh, where as ftp is a completely different protocol.

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I won't pretend to understand the intricacies of FTP vs SFTP. In short, there is no other way but to install software, correct? – Chris Oct 18 '12 at 21:13
@Chris correct. Ubuntu does not install a console ftp client with ssl/tls support by default. – h0tw1r3 Oct 19 '12 at 14:40

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