Hi vb.green,
I would suggest having a look at the SFXCL tip at the following location:
http://www.vandyke.com/support/tips/sfxcl_auto.html
If the remote server allows password authentication (it is possible that the server only allows keyboard-interactive authentication), you could work around the issue by adding the "/Password" option to your SFXCL command-line. This allows you to automate password entry.
Another option would be to use a pre-defined session with the password saved.
For automation though, publickey authentication may be your best bet.
Does this help you resolve the issue you are seeing?