I tried to connect with filezilla outside of my home network. This is the error I get:
Status: Resolving address of plex.theaddies.us
Status: Connecting to xx:xx:xx:xx:45555...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/mnt/BigdaddyZFS/Media/ftp_user" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PORT 192,168,42,183,191,109
Response: 200 PORT command successful
Command: MLSD
Response: 425 Unable to build data connection: Operation already in progress
Error: Failed to retrieve directory listing
Seems like I am getting closer but something is still wrong.