Just downloaded the newest trunk version, and noticed that the URLs for the SML and SMK are still pointing to the old location. The service was moved from https://sml.peppolcentral.org to the new location https://edelivery.tech.ec.europa.eu/edelivery-sml in June 2015. However, this has not been updated in the code, where 'sml.peppolcentral.org' still is the correct location.
At 08-05-2015, the issue https://joinup.ec.europa.eu/discussion/cipa-smp-client-console-still-only-use-start-protocol was created, and to this day nothing has happened, and nobody has replied.
Either this is not the correct place to post theses kind of issues, or the code is no-longer maintained.