001 Broken pipe

Enable the /var/log/vsftpd.log file:
In /etc/vsftpd.conf change xferlog_std_format=YES to NO and add log_ftp_protocol=YES.

If after attempting to Publish, the last line in the log says 227 Entering Passive Mode, then passive mode has failed.

To allow passive FTP connections the following modules must be loaded:
modprobe ip_conntrack
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp