Version 4.0| Version 4.0 |
User's Guide |
4. Configuring NetProxy Services
4.4. FTP Gateway Service
The FTP gateway service allows your network users to use File Transfer Protocol (FTP) clients to transfer files to and from the Internet.
The configuration
dialog for the FTP gateway service is shown below. For specific help on each of
the settings, click the Windows 'context help' icon at the top of the dialog
box in NetProxy, then select the item you wish to learn more about.
Local
Port
Specifies the TCP port number that the FTP gateway service should run on. When
configuring FTP clients to use NetProxy, this port must be entered as the
firewall or gateway port.
Bind To
Interface
Allows you to select a specific IP interface that NetProxy should bind the
service to. Any connection attempts not received on this IP address will be
blocked by the operating system before they even reach NetProxy's firewall.
For example, if the IP address assigned to your local network card is selected,
any connections arriving via your external IP interface (the one belonging to
your dialup or ADSL connection) will be rejected by Windows.
The FTP gateway is used only by dedicated FTP clients. Web browsers
such as Netscape Navigator or Microsoft Internet Explorer use either the SOCKS
protocol or "FTP over HTTP" to access files using FTP, rather than
the FTP gateway service.
Internally, the NetProxy FTP gateway uses the PASV command to allow
passive transfers to and from remote FTP servers. Most modern FTP servers
support the PASV command, but it is conceivable that you may come across an
older or lower-spec FTP server that does not support passive mode transfers. In
this event your FTP client will be told by NetProxy that the PASV command is
not supported on the remote server and the connection will be
terminated.