I have a linux server with Ensim Pro 10.3.0-fc.6.11 i386 /  ProFTPD Version 1.3.0a and there is a long delay when connecting. It seems to hang and mill around for up to 10 seconds at this point...
Code:

[11:12:05] Resolving host name "ftp.hardlinkhosting.com"
[11:12:05] Connecting to 212.78.79.26 Port: 21
[11:12:05] Connected to ftp.hardlinkhosting.com. 

This is especially annoying when using SmartFTP client 3.0 as it forces you to use the transfer queue and opens a new connection for the transferring (Could be a 20 seconds delay in uploading a 1KB html file)!

Below is my /etc/proftpd.conf file...
Code:

[root@ns1 ~]# cat /etc/proftpd.conf
# 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"
ServerType                      Standalone
DefaultServer                   on
SocketBindTight                 on
# Define this if you want to prevent your server from displaying what FTP
# server and version you are using.
ServerIdent                     on "Hardlink Hosting FTP Server ready."

#Time out parameters
TimeoutIdle                     600
TimeoutNoTransfer               600
TimeoutLogin                    300

# 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                            root
Group                           root

# To disable use of system-wide password file
PersistentPasswd off

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

# This is the PAM configuration file that will be referenced when
# authenticating.  It can be set globally and/or per VirtualHost.
# The default is 'ftp'. Note: all PAM configuration files must be in
# /etc/pam.d
AuthPAMConfig                   proftpd
AuthOrder                       mod_auth_pam.c* mod_auth_unix.c

# Don't let people pass % characters to the server and to protect against DoS attacks (Bugzilla ID 1066)
DenyFilter                      (\*.*/)|%

<Limit SITE_CHMOD>
AllowAll
</Limit>

RequireValidShell               on
</Global>

# Normally, we want files to be overwriteable.
<Directory /*>
  AllowOverwrite                on
</Directory>

<VirtualHost 127.0.0.1>
</VirtualHost>

include "/etc/proftpd/proftpd.conf.wp"
# include "/etc/proftpd/anonymousftp"

 

Wow thanks! That's sorted it out. It now connects pretty much instantly.

I added the below two lines to the /etc/proftpd.conf file...
Code:

UseReverseDNS off
IdentLookups off 

and then restarted proftpd...
Code:

service proftpd restart 

and that's it.

It seems that the above options are On by default even though not listed in proftpd.conf. I tried the two options separately and the one that slows it down most was the IdentLookups. The UseReverseDNS didn't make much different but I'll leave it off anyway.

Thanks Again!