I was using vsftpd but wanted more configuration flexibility so uninstalled vsftpd and installed ProFTPd. Afterwards, I reconfigured virtualmin to work with proftpd.
The problem I'm having is not that FTP doesn't work, but rather that the system is allowing anyone with an email address to use FTP to the server. They get jailed to their home dir, but I don't want them to have any FTP access at all.
I have no idea where to even start with troubleshooting this. Help!