Hola, tengo el proftpd instalado y configurado de la siguiente manera:
 
Código:
 Include /etc/proftpd/modules.conf
UseIPv6                         off
ServerName                      "avancexxi.com"
ServerType                      standalone
DeferWelcome                    off
DelayEngine                     off
ShowSymlinks                    on
MultilineRFC2228                on
DefaultServer                   on
ShowSymlinks                    on
AllowOverwrite                  on
LogFormat                       traff "%b %u"
TimeoutNoTransfer               600
TimeoutStalled                  600
TimeoutIdle                     1200
DisplayLogin                    welcome.msg
DisplayFirstChdir               .message
#LsDefaultOptions                "-l"
DenyFilter                      \*.*/
DefaultRoot                     ~
# Uncomment this if you are using NIS or LDAP to retrieve passwords:
#PersistentPasswd               off
# Port 21 is the standard FTP port.
Port                            21
# 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)
MaxInstances                    30
# Set the user and group that the server normally runs at.
User                            nobody
Group                           nogroup
# Normally, we want files to be overwriteable.
<Directory /*>
  # Umask 022 is a good standard umask to prevent new files and dirs
  # (second parm) from being group and world writable.
  Umask                         022  022
  AllowOverwrite                on
  HideNoAccess on
</Directory>
<Limit ALL>
  IgnoreHidden on
</Limit>
<Global>
        TransferLog                     /var/log/xferlog
        ExtendedLog                     /var/log/ftp_traff.log read,write traff
        PathDenyFilter "\.quota$"
</Global>
#
# VHCS2 Managment;
#
SQLAuthTypes            crypt
SQLAuthenticate         on
SQLConnectInfo          vhcs2@localhost vftp u7eoLRcOe4bN2rB8
SQLUserInfo                     ftp_users userid passwd uid gid homedir shell
SQLGroupInfo            ftp_group groupname gid members
SQLMinID                        2000
#
# VHCS2 Quota management;
#
QuotaEngine on
QuotaShowQuotas on
QuotaDisplayUnits Mb
SQLNamedQuery get-quota-limit SELECT "name, quota_type, per_session, limit_type, bytes_in_avail, bytes_out_avail, bytes_xfer$
SQLNamedQuery get-quota-tally SELECT "name, quota_type, bytes_in_used, bytes_out_used, bytes_xfer_used, files_in_used, files$
SQLNamedQuery update-quota-tally UPDATE "bytes_in_used = bytes_in_used + %{0}, bytes_out_used = bytes_out_used + %{1}, bytes$
SQLNamedQuery insert-quota-tally INSERT "%{0}, %{1}, %{2}, %{3}, %{4}, %{5}, %{6}, %{7}" quotatallies
QuotaLock /var/run/proftpd/tally.lock
QuotaLimitTable sql:/get-quota-limit
QuotaTallyTable sql:/get-quota-tally/update-quota-tally/insert-quota-tally
  (Como se puede ver utilizon el panel vhcs2)
Bien cuando inicio el servicio me arranca bien: 
Código:
 /etc/init.d/proftpd restart
Stopping ftp server: proftpd.
Starting ftp server: proftpd.
  Y el servicio se puede ver que está corriendo: 
Sin embargo al intentar conectar me sale esto: 
Código:
 ftp localhost
Connected to localhost.localdomain.
421 Service not available, remote server has closed connection
ftp>
  ¿Alguien sabe que puede estar pasando? Tengo algo incompatible en el .conf? 
Gracias de antemano.