Re: FTP commands issue

Hi Patrik,

- This is via a VPN and according to the network admin all the ports are open.

- I can connect to the FTP server and log in.

- After logging in I run:
ftp> quo pasv 1
227 Entering Passive Mode (10,15,7,203,83,239).

- Return message after a while (or it just hangs) is:
Could not connect to port.

- I have tried EPSV as well, with the same results.

-mark

On 2/9/2024 12:13 PM, Patrik Schindler wrote:

Hello Mark,

Am 09.02.2024 um 02:08 schrieb mlazarus<mlazarus@xxxxxxxxxxxx>:

Any idea what might be causing this? Or how to debug it? TIA.

As Marc pointed out, it's an active-passive issue.

Active mode FTP means, the client instructs the server to build a *new* (data) connection back to the client. This mostly fails because the client's IP address is behind a NAT gateway and not reachable from the internet.

Passive mode FTP means, the client instructs the server to open a *new* (data) port where the client connects to: Same direction as the initial control connection. This usually works.

If you want to automate things via command line ftp, you probably need a command line client on Windows supporting passive mode.

Another viable solution would be to use sftp or scp which uses the ssh protocol for transmission. The PuTTY installation package provides command line tools for automation purposes.

:wq! PoC