After having installed the new Trusty 14.04 LTS release – finally, I came across a problem that showed to be caused by the “new” default security setting of Gnome Vino. I was no longer able to connect to the console through XRDP:

Fix is simple:
user@localhost:~$ gsettings set org.gnome.Vino require-encryption false
Of course you need to enable desktop sharing, allow other users to view your desktop and require the user to enter a password when connecting in the preferences, like before.
After that, login again and you are able to connect to the console via XRDP again.