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proftpd:421 Service not available, remote server has closed connection

2:37 pm on Feb 17, 2013 (gmt 0)

New User

joined:Feb 16, 2013
posts: 3
votes: 0

hello experts,

please help.

On debian 5, command line when i test ftp:
> ftp example.com
I get a 421 Servcie Not Available Error

what could be the problem. I am not an expert with the .conf
many settings are still default.
here is my .conf file

# Includes DSO modules
Include /etc/proftpd/modules.conf

# Set off to disable IPv6 support which is annoying on IPv4 only boxes.
# If set on you can experience a longer connection delay in many cases.




DisplayLogin welcome.msg
DisplayChdir .message true
ListOptions "-l"

ServerLog /var/log/proftp/log
Umask 022

# Use this to jail all users in their homes
# DefaultRoot~

# Users require a valid shell listed in /etc/shells to login.
# Use this directive to release that constrain.
# RequireValidShelloff

# Port 21 is the standard FTP port.

# In some cases you have to specify passive ports range to by-pass
# firewall limitations. Ephemeral ports can be used for that, but
# feel free to use a more narrow range.
PassivePorts 49152 65534

# If your host was NATted, this option is useful in order to
# allow passive tranfers to work. You have to use your public
# address and opening the passive ports used on your firewall as well.
# MasqueradeAddress1.2.3.4

# This is useful for masquerading address with dynamic IPs:
# refresh any configured MasqueradeAddress directives every 8 hours
<IfModule mod_dynmasq.c>
# DynMasqRefresh 28800

# To prevent DoS attacks, set the maximum number of child processes
# to 30. If you need to allow more than 30 concurrent connections
# at once, simply increase this value. Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
# Set the user and group that the server normally runs at.

# Normally, we want files to be overwriteable.

# Uncomment this if you are using NIS or LDAP via NSS to retrieve passwords:

# This is required to use both PAM-based authentication and local passwords
# AuthOrdermod_auth_pam.c* mod_auth_unix.c

# Be warned: use of this directive impacts CPU average load!
# Uncomment this if you like to see progress and transfer rate with ftpwho
# in downloads. That is not needed for uploads rates.
# UseSendFileoff

TransferLog /var/log/proftpd/xferlog
SystemLog /var/log/proftpd/proftpd.log

<IfModule mod_quotatab.c>
QuotaEngine off

<IfModule mod_ratio.c>
Ratios off

# Delay engine reduces impact of the so-called Timing Attack described in
# http://security.lss.hr/index.php?page=details&ID=LSS-2004-10-02
# It is on by default.
<IfModule mod_delay.c>
DelayEngine on

<IfModule mod_ctrls.c>
ControlsEngine off
ControlsMaxClients 2
ControlsLog /var/log/proftpd/controls.log
ControlsInterval 5
ControlsSocket /var/run/proftpd/proftpd.sock

<IfModule mod_ctrls_admin.c>
AdminControlsEngine off

# Alternative authentication frameworks
#Include /etc/proftpd/ldap.conf
#Include /etc/proftpd/sql.conf

# This is used for FTPS connections
#Include /etc/proftpd/tls.conf
# Deny writing to the base server...
<Limit WRITE>
# Bar use of SITE CHMOD by default

<Limit LOGIN>
AllowUser culser
9:54 am on Feb 25, 2013 (gmt 0)


WebmasterWorld Administrator phranque is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

joined:Aug 10, 2004
votes: 61

welcome to WebmasterWorld, culser!

have you checked your ftp log files for clues?

if i had to guess i would look first for authentication issues.
4:08 pm on Apr 7, 2013 (gmt 0)

Full Member

Top Contributors Of The Month

joined:Mar 14, 2013
votes: 2

Check to see if proftp is running (ps xa | grep ftp). If it's not, start it (probably in /etc/inet.d).

If it's running and is still unavailable check to see if there is a firewall running and, if so, add a rule to allow tcp/udp to Port 21.

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