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

FTP has multiple connections. If you setup 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 multiple ways.

  1. Configure your server to use a range of ports for a transfer (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 IP Address
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