ARM+Linux FTP service upload fails

basic introduction:

ftp> put file
local: hello remote: hello
200 PORT command successful.
425 Can't build data connection: Connection timed out.

solve:

The connection is establishing but it is unable to set up the return data path.

This is likely because something in the path isn't supporting PORT mode ftp from the source (the perimeter router perhaps).

Try using ftp -p which will begin the client in passive (PASV) mode.

Therefore, when ftp linking the destination address, use ftp -p 192.168.***.***

I found it from the foreign language website. I have been looking for a day on the domestic website.

The address is here, and there are other problem analysis: click to open the link