Some FTP error messages:
"Server sent passive reply with unroutable address 999.888.777.666"
"421 Failed to create data connection socket."
Other symptoms: success ftp authentication but failed folder content downloading.
I spent hours solving the problem.
One possible solution on Windows 10:
Check your Wifi connection type! Public or private?
Open Windows 10 settings --> Network and Internet -> Wifi -> Click on active Wifi connection
If the wifi network profile is public check out the private.
I hope I save a few hours for someone else.
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