Status: Connecting to 192.168.1.66:21...
Status: Connection attempt failed with "ECONNREFUSED - Connection refused by server".
Error: Could not connect to server
port are picked in setting 50000-50100 and successfully open on my router.
port 21 is not listened.
What's the point of running a non-native FTP Server on Linux?
See: Ubuntu: FTP Server (for a native Linux suggestion).
This is bread and butter for Unix-based Operating Systems...
Obviously it would be much better (more secure) to use something like: SFTP
See: SSH File Transfer Protocol.