proftpd (Maintanance in progress)

Meu Conectiva 9.0 tem o proftpd-1.2.7 instalado. Quando dou start no servico ele parece funcionar sem problemas, mas ao tentar conectar acontece

# ftp 0
Connected to 0.
500 FTP server shut down (Maintanance in progress) -- please try again later.

O servico continua ativo

# ps ax | grep proftpd
3819 ? S 0:00 [proftpd]

A minha configuracao eh padrao.
###########################################
ServerName "ProFTPD - Default Instalation"
ServerType standalone
DefaultServer on
ScoreboardFile /var/run/proftpd/scoreboard
DeferWelcome on
ServerAdmin root@localhost
SyslogFacility AUTH

DefaultRoot ~ !root
User nobody
Group nobody
##########################################

alguem sabe dizer porque isso acontece?