FTP ports

WD Legacy Products Other Network Drives
#1

I’ve been reading posts here about FTP and ports.

I’ve tried to change FTP port  (and forwarded it in the router) but it wount work. Only port 21 works.

If I however use same public and private port (like 8765/8765), my FTP client (Zilla and Total Commander) connects but woun’t list the maps.

Any idea  where I’m doing something wrong?

Should I use UPnP?

I found that active mode works better. Why is that?

#2

Does port 21 work fully? If so it’s possible something is wrong with the forwarding on the router.