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Universal Plug and Play (UPnP)
UPnP can solve NAT (Network Address Translation) connection problems with active (PORT) mode.
The client is behind a NAT and wants to connect to an FTP server supporting PORT mode only (because the server is behind a NAT as well or due to security / firewall policies). In this case without UPnP the ports have to be manually enabled and forwarded in the NAT router and a port range has to be defined in the FTP client configuration. With the new (UPnP) feature everything is automatically handled for the user.
UPnP Advantages and FTP
Note: The change is saved and active for future FTP sessions of this favorite item.