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. 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.

How to read filezilla logs passive ftp