ECONNREFUSED – Connection refused by server

The firewall is likely blocking port 20 or 21. This article explains how to correct the problem on Windows XP. The procedure should be similar on Windows 7. As it suggests, both port 20 (FTP client) and 21 (FTP server) should be opened (unblocked) so you can use FTP and respond to FTP requests.

While this question is old, there's no really comprehensive answer. So I'm adding one.

In the passive FTP mode (the most common mode nowadays), the FTP server listens on port 21 for an FTP control connection. But for all data transfers, including directory listings, it listens on an additional port. The port is picked out of a configured port range.

If you open only the 21 control port on the firewall, you get the described behavior. You can connect, but you cannot list directories or transfer files.

For details, see my article on Network configuration for passive FTP mode.

You have to go to Control Panel > System and Security > Windows Firewall > Advanced Settings > Inbound Rules > New Rule and add a new inbound rule for data port range your FTP server is using.

The port range that the FileZilla FTP server is using, is configured in Edit > Settings > Passive mode settings > Use custom port rage. You can configure a narrow range (like 10 ports), to limit a number of opened ports. You should use port numbers 1024 and above (up to 65535).