Não há diretivas definidas na sua configuração. Você precisa criar algumas diretivas para o Proftp usar. A página man ajudará com isso.
Veja a configuração que você está procurando:
## Includes required DSO modules. This is mandatory in proftpd 1.3
# Include /etc/proftpd/modules.conf
# To really apply changes reload proftpd after modifications.
AllowOverwrite on
AuthAliasOnly on
AuthPam on # Uses unix authentication.
UserAlias userftp connor # UserAlias *loginuser* *real user*
ServerName "uk.domain.com"
ServerType standalone
DeferWelcome on
MultilineRFC2228 on
DefaultServer on
ShowSymlinks off
TimeoutNoTransfer 600
TimeoutStalled 100
TimeoutIdle 2200
DisplayChdir .message
ListOptions "-l"
RequireValidShell off
TimeoutLogin 20
RootLogin off
# It's better for debug to create log files ;-)
ExtendedLog /var/log/ftp.log
TransferLog /var/log/xferlog
SystemLog /var/log/syslog.log
#DenyFilter \*.*/
# I don't choose to use /etc/ftpusers file (set inside the users you want to ban, not useful for me)
UseFtpUsers off
# Allow to restart a download
AllowStoreRestart on
# Port 21 is the standard FTP port, so you may prefer to use another port for security reasons (choose here the port you want)
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 8
# Set the user and group that the server normally runs at.
User nobody
Group nogroup
# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
Umask 022 022
PersistentPasswd off
MaxClients 8
MaxClientsPerHost 8
MaxClientsPerUser 8
MaxHostsPerUser 8
# Display a message after a successful login
AccessGrantMsg "welcome !!!"
# This message is displayed for each access good or not
ServerIdent on "Already home"
# Lock all the users in home directory
DefaultRoot ~
MaxLoginAttempts 5
#VALID LOGINS
<Limit LOGIN>
AllowUser connor # Must be *real* user
DenyALL
</Limit>
<Directory /home/>
Umask 022 022
AllowOverwrite on
<Limit MKD STOR DELE XMKD RNEF RNTO RMD XRMD READ RMD>
DenyAll
</Limit>
<Limit STOR CWD MKD>
AllowAll
</Limit>
</Directory>