With the upgrade of FileZilla, it requires many of you to update your connection settings and avoid getting repeat connection errors. Now, rather than using the host name ftp.your-website.com, you should be using sftp://ftp.your-website.com , and use port 22 (to open an SFTP session).
We have created a new User Manual article topic for this, “How to upload/download files to/from your server using FTP, FileZilla“.