I am trying to use the WS_FTP Pro SDK to connect to an SFTP server. I am able to connect to the SSH server via other programs (CoreFTP, WODSSH.NET SSH Component), but when I try to connect via the WS_FTP Pro SDK , I am receiving the following error:

Finding Host [hostname] ...
Connecting to [ip]:[port]
Connected to [ip]:[port] in 0.062499 seconds, Waiting for Server Response
Server Welcome: SSH-2.0-SSH_x.x
Client Version: SSH-2.0-WS_FTP-8.01-2000.09.23
DSS Signature Verified
Session Keys Created
Ciphers Created
New Client->Server ciphers in place.
New Client->Server ciphers in place.
Completed SSH Key Exchange.  New Keys in place.
Server has disconnected for reason 2 (SSH_DISCONNECT_PROTOCOL_ERROR)
"Too many authentication failures for [username]"
Failed SSH User Authentication
SSH Transport closed.
In Connect, connection failed, error: 84280000

The username and password are definitely correct. I have tried setting the SFTPVersion property to 3 and 4, as well as trying creating the connection via URL and separate properties.

WS_FTP Pro SDK version is 8.01

Connecting via WS_FTP Professional client yields a username/password error dialog... but I am certain of the username and password being used... I have verified that they work from within other programs immediately after having gotten these errors in the SDK and client program.

Has anyone else experienced this problem and found a solution?

For anyone who may run into the same problem...

It appears that the SFTP server I am connecting to requires keyboard-interactive logins... unfortunately as far as I know the SDK is not able to facilitate this at this point in time.

yes, that is correct, the SDK does not support keyboard authentication.

Claudio Robles
WS_FTP Team