I was chatting with my server company (media temple) and shared your screenshot.
This is what they sent me:
FileZilla is attempting to use TLS encryption with a regular FTP connection. This will not work and is an issue with the new version of FileZilla. To resolve the issue they will need to create a connection in File/Site Manager, and select plain FTP only as the encryption type.
I use cyberduck and I can connect to the FTP easily.
Let me know if that resolves the issue to connect to the FTP.