1. You are entering an invalid username or password. You need to use your Centova Cast account's username and password. Make sure that you're not using the Centova Cast 'admin' account, and that you're not accidentally using your source authentication password instead of your server password.
2. If you are also using a web hosting control panel on the same server as Centova Cast, it's likely that the web hosting control panel's FTP server is running instead of Centova Cast's. You would need to install Centova Cast's FTP server on an alternate IP address or port if you wish to run both of them at once.