Question

I m trying to ftp a file using passive ftp but I get a timeout (12002) when the put command is called.

I m able to use passive ftp with other ftp sites but not this new one.

I ve tried this using three different ways on the same server:

FileZilla Client in passive mode - this works

WinINet libarary in passive mode - I get a timeout when calling PutFile

IE 6 in passive mode - I get a timeout when the directory listing is attempted

This is on a Windows 2000 server.

I assume my firewall is set up correctly since FileZilla worked.

Can anyone help me figure out what s going on?

Answer 1

In Passive mode, the FTP server opens a port on its end and tells the FTP client the IP/Port it needs to connect to. On the client end, it creates a new socket, binds it to a local IP/Port (usually a random IP/Port unless configured otherwise), and connects to the server s specified IP/Port. Without actually seeing a trace log from a network packet sniffer, like Wireshark, then I would guess that either a firewall/router on the client end is blocking the outbound connection, or a firewall/router on the server end is blocking the inbound connection. The fact that FileZilla is getting through OK probably means that the IP/Port pairs on both ends of the connection happen to match all the firewall/router rules for accepting connections on both ends, whereas something in the WinInet/IE IP/Port pairs is getting rejected instead. That is a little unusual since Passive mode tends to be more firewall/router friendly than Active mode, though. Have you tried using Windows command-line ftp.exe utility to see if it works or not? BTW, IE uses WinInet for all of its connections.

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