How to port forward passive FTP from a router - Super User
https://superuser.com/questions/1258005/how-to-port-forward-passive-ftp-from-a-router
WebOct 11, 2017 · You need to: Forward the FTP control connection port 21. Forward the passive mode data connection port range (server-specific, usually configurable). Configure your FTP server with the external IP address of the router, so that the server reports the correct address to the clients. Some references:
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