Netcat FTP active mode file transfer not working - ftp

Question

Im trying to download a file from a FTP server using active mode.However,it looks like my connection just"expire" or something each time.First,I open a port on my computer using netcat,ex:
nc -vv -l -p 62077
this will listen on port 62077 on my computer.Then,I open another netcat windows,log in to the FTP link using port 21,and once im in the directory where the file I want is in,I do
PORT (my IP separated by , ),(242,125(wich equals to port 62077)\r\n
However,after I enter this command,nothing happen for about 10-15 seconds,and the netcat just quit without saying anything.Nothing happen either on the netcat window that is listening on port 62077.It does that everytime,I dont know what I am doing wrong.I did the same thing with Filezilla(in active mode) and examinated the commands with wireshark,I do the exact same command as Filezilla,however filezilla will be able to retrieve the file while netcat wont.I want to retrieve it with netcat and I dont know what im doing wrong.I am using Windows 10.
thank you!

Answer 1

After you have established your listening nc socket, and after you have sent the USER, PASS, and PORT commands, you then need to trigger the file transfer to that listening socket using e.g.:
RETR /path/to/file/to/download
on the control connection. (Unless you actually are already doing this, but didn't mention it in the post?)
Also, just to note: you mention using something like this:
PORT 1,2,3,4,(242,125)\r\n
Right? Those parentheses might also be an issue. Instead, you might try:
PORT 1,2,3,4,242,125\r\n
without any parentheses.
Now, depending on the IP address you sent (hopefully not a private network address), the data transfer may still not happen, due to firewalls/routers/NAT on the client side of things. Given that your Filezilla download of the same file works, I suspect that those firewall/router/NAT issues may not apply.
Hope this helps!