If that's the case, most usual problem is that some firewall (or the NAT) on the way between you and the server blocks the connection attempt to the data port (as reported in the response to the PASV command). Though as you mention that "Browsing is nearly impossible", it looks like that it does not help. So in most cases, you won't notice the problem at all. When encountering this, FileZilla tries to connect to the primary address of the FTP server instead, as that is usually the correct address to use. You should see the offending address in the FileZilla log: FileZilla does too and reports the mentioned message.
The FTP server must report its external IP address, that can be used outside the NATted networks.Īs this is unfortunately a common issue, many FTP clients try to detect this (by checking that the reported IP address is within the range of addresses reserved for local communications within a private network). It's clearly a misconfiguration of the FTP server. FileZilla expects further lines, then the server sends a different response. If your log is complete, and you didn't mix up multiple simultaneous connections, then the server started a multi-line response but never finished it. When it reports such IP address to a client outside the NAT, the IP address is obviously of little use. 226-First line 226-Second line 226-Third line 226 Last line. Once you’ve opened the file, confirm that the anonymousenable directive is set to NO and the localenable directive is set to YES: /etc/nf. In the past, it has also been used for uploading but. Open this file using your preferred text editor. File Transfer Protocol (FTP) is a TCP protocol for downloading files between computers. And it's aware of its local address within its NATted network only. The two key settings for this are already set in nf. It's quite common though that the FTP server is behind a NAT.
The client should connect to that IP/port to initiate the transfer. The server responds with its IP address and port number. To establish a data connection for a file transfer or a directory listing, an FTP client (in the passive FTP mode) sends PASV command to the server.
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