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It’ll give you some basic info about the server and also auto-detect if you are behind a NAT router. Once connected to the server, you’ll get a screen like below. This is not an error but a warning giving you some basic information you need. You may also want to see how to access FTP Server from your browser: How to create a shortcut and access Filezilla from Windows Explorer. These are port 21 for the command port and port 20 for the data port. FTP is a service that utilizes two ports, a “data port” and a “command” port (also known as the control port). To reiterate further, FTP is a TCP-based service exclusively and there isn’t a UDP component to FTP. Both server and client support FTP and FTPS, while the clients can also connect to SFTP servers.
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FileZilla Clients are available for Windows, Linux, and macOS, but the servers are available only in Windows. Kindly refer to this detailed guide on how to connect to a FileZilla Server: How to install and configure a FileZilla Server on Windows. FileZilla supports TLS, the same level of encryption supported by your web browser, to protect your data. FileZilla Server is a server that supports FTP and FTP over TLS which provides secure encrypted connections to the server.
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