SecureBlackbox 16: I can't login to the server with my username and password, but I can login to other programs 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 setup 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).