How to connect to FTP server which requires SSL authentication?

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# 1  
Old 10-31-2011
How to connect to FTP server which requires SSL authentication?


I tried searching through lot of threads for a solution but couldn't fetch the exact solution, so I am creating a new thread.

I am trying to connect to a FTP server

1) using a simple FTP command, it gives the error :
534 Policy requires SSL.
Login failed.

2) using SFTP command on port number 21
ssh_exchange_identification: read: Connection reset by peer
Couldn't read packet: Connection reset by peer

3) using curl command, it throws following error
curl: (67) Access denied: 534

I am stuck at this point and could not think of any solution. Let me know if I am missing out on anything here.

Thanks in advance & apologies if a similar thread already exist.


Last edited by Scott; 11-09-2011 at 03:35 PM.. Reason: Code tags...
# 2  
Old 10-31-2011
1. May be due to iptables or other firewalls. Try turning off the firewall and then ftp.
For turning off iptables, do /etc/init.d/iptables stop

2. SSH keys are not setup (Search for "passwordless ssh" in or the SSH daemon is not running.
[root@bt]ps -eaf | grep sshd
root      1987     1  0  2010 ?        00:00:00 /usr/sbin/sshd

To start the ssh daemon /etc/init.d/sshd start

3. Same as 1.

Make sure the ftp daemon is running on the server. Mine is vsftpd.
[root@bt]ps -eaf | grep ftp
root      2083     1  0  2010 ?        00:00:00 /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf

To start the ftp daemon
/etc/init.d/vsftpd start

# 3  
Old 10-31-2011
there are some ftp-protcolls that use ssh/ssl. Did you try FTPS or FTP over SSH?
# 4  
Old 10-31-2011
Hi Ahamed,

Thanks for your response. I tried all the options you have suggested.
1) Turned off the firewall
2) SSHD services were running

But it did not help Smilie

@Cero : could you please elaborate on those options with an example. I haven't tried those.


- Amit
# 5  
Old 10-31-2011
Did you get information about the used protocol when you got username and password?
I'd try the easiest method first. Issue AUTH SSL before sending username and password in an normal ftp-session.
I never had to use FTP over SSH - its basically tunneling normal FTP over an ssh-connection.
For FTPS you need a client that can handle that protocol like lftp. Opening a connection with lftp could look like this:
lftp -c 'open -e "set ftps:initial-prot ""; \
   set ftp:ssl-force true; \
   set ftp:ssl-protect-data true; "\
   <your FTP command>; " \
   ftps://HOSTNAME:990 '

# 6  
Old 10-31-2011
Hello Cero,

I tried that option, it is throwing an error :
/lib64/ undefined symbol: inflateEnd
connect: ftp - not supported protocol

Do we have to set up any env variables before using lftp ?

- Amit

Last edited by Scott; 11-09-2011 at 03:37 PM.. Reason: Code tags
# 7  
Old 10-31-2011
Which option did you try? AUTH SSL or ftps?
For ftps you need a version of lftp compiled with tls support. This one for example supports ftps transfers:
$ lftp -v
LFTP | Version 3.7.3 | Copyright (c) 1996-2008 Alexander V. Lukyanov

LFTP is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
There is absolutely no warranty for LFTP.  See COPYING for details.

Send bug reports and questions to <>.

Libraries used: Readline 5.2, GnuTLS 2.4.2, zlib

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