config 파일에 오류가 있다는 이야기입니다.
아마 proftpd.conf 에 standalone 으로 구동하는 옵션이 없고 xinetd를 이용하게 되어 있는듯 싶네요..
ServerType 부???을 확인해 보시기 바랍니다.

Servertype 부분도 standalone인데 그러네요^^ 저의 config 파일을 올려보겠습니다.

# This is a basic ProFTPD configuration file (rename it to
# 'proftpd.conf' for actual use. It establishes a single server
# and a single anonymous login. It assumes that you have a user/group
# "nobody" and "ftp" for normal operation and anon.

ServerName "ProFTPD Default Installation"
ServerType standalone
DefaultServer on

# Port 21 is the standard FTP port.
Port 21

# Umask 022 is a good standard umask to prevent new dirs and files
# from being group and world writable.
Umask 022

# 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 under which the server will run.
User nobody
Group nogroup

# To cause every FTP user to be "jailed" (chrooted) into their home
# directory, uncomment this line.
#DefaultRoot ~

# Normally, we want files to be overwriteable.
AllowOverwrite on

# Bar use of SITE CHMOD by default

DenyAll


# A basic anonymous configuration, no upload directories. If you do not
# want anonymous users, simply delete this entire section.

User ftp
Group ftp

# We want clients to be able to login with "anonymous" as well as "ftp"
UserAlias anonymous ftp

# Limit the maximum number of anonymous logins
MaxClients 10

# We want 'welcome.msg' displayed at login, and '.message' displayed
# in each newly chdired directory.
DisplayLogin welcome.msg
DisplayFirstChdir .message

# Limit WRITE everywhere in the anonymous chroot

DenyAll

음..conf 파일에서는 크게 문제있어 보이는 부분이 없???데..이상하군요..^^;