There is a common issues with Filezilla where you may get the error messages when trying to connect.
Error: Connection timed out after 20 seconds of inactivity
Error: Failed to retrieve directory listing
To correct, you will need to set the site up in the Filezilla site manager, the quick connect option will not work. In Filezilla, click on File > Site Manager and add your site there. Under the Encryption option choose Only use plain FTP (insecure)