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As there are two questions about Passive vs. Active FTP mode
And if we kindly omit existence of FTP over SSH or FTPS (aka FTP with SSL/TLS)
What are security pros and cons of using Passive FTP?
My question comes out from experience that nearly every FTP I’ve came to touch with, was using Passive mode. So if it wasn’t result of internal security policy, than please what is the motivation for using Passive FTP mode?
FTP is not secure, and never will be. The only reason to use passive ftp is that it works through any kind of firewall, as all connections are initiated by the client. Active FTP has the server connecting BACK to the client to initiate data transfers, which dumb firewalls will disallow, as they have no way to know that the incoming connection is related to the FTP connection and should be allowed through.