There are are few configurations that you need to check:
First, verify you have port 21 open on your firewall. Most distro's come with the Firewall set to 'high' and therefore port 21 is closed.
Second, verify your '/etc/hosts.deny', '/etc/hosts.allow', and '/etc/hosts' files are configured to allow outside IP address/hosts.
Third, verify your '/etc/vsftpd.ftpusers' and '/etc/vsftpd.user_list' is configured to allow those users you do not want to login are in the file.
That should allow outside users to logon to your ftp server.
JN
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