New Post: C# SSHNET ISSUE

What version of SSH.NET are you using ?
Please try using the latest beta as there have been some fixes in this area.
You should at least get an SshAuthenticationException when authentication fails.

I tried using keyboard-interactive authentication myself just now, and it works fine for me.
Note that I haven't tried an empty password.

Please verify whether your ssh server indeed is configured to allow empty passwords (PermitEmptyPasswords is false by default, if I'm not mistaken).

Hope this helps,
Gert