Hello Sebastian,
The Disclaimer message can be disabled in the SLAC. (With Secure Login Server 2.0 the disclaimer messages are disabled by default)
But to hide the "Host not found" and "Authentication completed" messages you will need Secure Login Client 2.0. Here you can configure showErrorMsg=0 and showSuccessMsg=0 and the user wont be bothered with message boxes.
Kind regards,
Jochen