FTP server Anti-Virus scanning like WAF
DNAT/NAT/Load balancing rule or WAF should have FTP server option. So that any files uploaded or downloaded from FTP server in any secured ZONE like LAN or DMZ should be protected. Cyberoam has such facility but it is lacking on SOPHOS. If FTP client upload ransomware or virus than it will blow up the secure network. it is security loop hole.