SecureBlackbox 16: I can't login to the server with a username and password. Other programs do this fine. Is this a bug?

Most likely, the server is using not password-based authentication, but keyboard-interactive authentication. SecureBlackbox supports both authentication types. For more details about how to set up the application for keyboard-interactive authentication, see the how-to article in the help file.

Starting from version 5, SecureBlackbox handles keyboard-interactive authentication automatically; i.e., you don't need to implement the OnAuthenticationKeyboard event handler in most cases. You need to ensure that the AuthenticationTypes property includes Keyboard-Interactive, though (it's included by default, but if you change the value of this property, remember to have Keyboard-Interactive included).