How to get vsftpd to log FTP connections

[fishface]

I currently use vsftpd and it logs uploads and downloads fine, logs them to vsftpd.log and logrotate rotates these every week 52 times, however, if a FTP user logs in and does not upload or download anything nothing is logged - I have tried a few options, for example, "dual_log_enable=YES" but this caused vsftpd to not start. I wish to log all FTP connections.

I'm find the options confusing, and I believe some are mutually exclusive or something?

Sample of my vsftpd.conf - on Red Hat Linux release 9 (Shrike)

# Activate logging of uploads/downloads.
xferlog_enable=YES
#
#
# You may override where the log file goes if you like. The default is shown
# below.
xferlog_file=/var/log/vsftpd.log
#
# If you want, you can have your log file in standard ftpd xferlog format
xferlog_std_format=YES
#