I have a port forward to my FTP server. It is working but transfers fail. Why?

FTP uses multiple connections. If you set up a port forward for the control session (port 21) then you must also setup a port forward for the transfer sessions. You can do this in a few different ways:

  1. Configure your server to use a range of ports for a transfer (for example, 10000-20000) and configure Untangle to forward all of these ports to the FTP server.
  2. Use 1:1 NAT.
  3. Use a Bypass Rule for the FTP server's IP address. (Please be aware that bypassing devices removes their traffic from all Untangle filtering.)
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