Why do I get a warning about encryption when I connect to my website?

[Vanderburg]

Most modern FTP clients (including FileZilla and WinSCP) now prioritize encrypted connections by default. You may see a certificate warning if you are connecting to your website via FTP because the accompanying certificate is not recognized or has expired.

You could disable encryption within your FTP client, or use SFTP instead (recommended).

SFTP uses the same credentials as FTP, but connects on port 22 instead of port 21. SFTP is fully encrypted and does not have a limit for simultaneous connections or a transfer limit for large files.