Using CuteFTP behind a Router
In most cases, CuteFTP does not have any problems working behind a router. If you are having problems, try transferring in PASV mode.
To transfer in PORT mode or for secure transfers, refer to your router's documentation for information on how to configure the router for such transfers.
If you are behind a NAT firewall and the FTP server is on a different network, you can only make data transfers in PORT mode using a Clear Command Channel SSL connection.
If connections or transfers fail, try one or more of the following possible solutions:
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Ask the FTP server's administrator if the server and its network are configured to allow FTP in PASV mode.
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Review the router documentation for information on how to set it up for FTP or how to open the appropriate ports. FTP generally uses port 21.
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Define a port range for CuteFTP.
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Use UPnP (if your NAT or router supports it) to establish a connection properly.
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Turn on port mapping.