I can connect securely using SafeTP, but the FTP connection freezes as soon as I try to initiate a data transfer (or get the first file listing). Whats the problem?
(top) A: The FTP protocol uses 2 types of connections to get its work done – the control channel is used for authentication and sending commands and replies, while separate data channel connections are used to transmit files and file listings. Failure to establish a data connection while using SafeTP is almost always caused by a firewall, proxy or NAT product sitting on the network somewhere between the client and the server – this may include things like corporate firewalls, Linux IP masquerading, software or harware based “home firewalls”, or even things like Microsoft Internet Connection Sharing. These products typically try to eavesdrop on the FTP control channel to get clues about the data connections being established, but SafeTP is specifically designed to prevent such eavesdropping on the control channel, so these products frequently get confused and fail to work properly. See the SafeTP firewall page for information about how to solve these problems.
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