Implicit SSL: Explicit normally listens on an unencrypted port (e.g. However, a side effect of encryption is it prevents a firewall from inspecting packets to dynamically open FTP ports.įTPS Explicit vs. This is an valid option over SFTP, and in some ways more secure (some common SSH algorithms have known vulnerabilities). This encrypts the communication over a TLS layer. There is also newer Extended Passive (EPSV) mode that should be used if that option exists as this is more "NAT/router friendly".įTPS (FTP+SSL/TLS). This helps being more "firewall friendly". On top of this strange behavior, there are multiple variants of FTP:Īctive vs. Is this the actual IP address or did you provide this IP only as an example?ĭebug logs would help if you can provide those.įTP is a very strange protocol, using 2 separate ports for COMMAND and DATA, and by default (Active FTP), the DATA channel actually initiates from the FTP server and sent to the FTP client. 172.22.x.x looks like a class B private address so is not a routable IP.
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