@daniel
Have you checked port 21?
@daniel Maybe the password DB for VPN logins is synced by uploading via FTP and triggering the DB sync via telnet as root. And to protect the network from intruders, you *have* to block NTP, IMAP and SMTP! It's just logical.
@daniel
Probably because they're using Exchange plus Outlook and any other client is frowned upon enterprisely.
Haven't tried 23 😂