Filezilla FTP Server Fails to Retrieve Directory Listing

Question

I'm running Filezilla Server 0.9.45 beta to manage my server remotely. After setting it up, I tested connecting to it using the IP 127.0.0.1, and it worked successfully. However, to connect to the server remotely, I port forwarded to port 21, and tried to connect using my computer's IP.

Status: Connecting to [My IP]:21...
Status: Connection established, waiting for welcome message...
Response:   220 Powered By FileZilla Server version 0.9.45 beta
Command:    USER hussain khalil
Response:   331 Password required for user
Command:    PASS *********
Response:   230 Logged on
Status: Connected
Status: Retrieving directory listing...
Command:    CWD /
Response:   250 CWD successful. "/" is current directory.
Command:    PWD
Response:   257 "/" is current directory.
Command:    TYPE I
Response:   200 Type set to I
Command:    PORT 192,168,0,13,205,63
Response:   200 Port command successful
Command:    MLSD
Response:   150 Opening data channel for directory listing of "/"
Response:   425 Can't open data connection for transfer of "/"
Error:  Failed to retrieve directory listing

This continues to work locally, but not when connecting remotely... How can I fix this?

Answer 1

I just changed the encryption from "Use explicit FTP over TLS if available" to "Only use plain FTP" (insecure) at site manager and it works!