We've moved all the remote assistance stuff on the linuxmce server. If you want to use it to connect to a someone's system, he needs to enable remote assistance from pluto web admin (Wizard->Security->Remote Access) and then tell you the remote assistance code.
The remote assistance code is formed from two numbers, first is the installation id of that computer and the second number is the password that you need to use when you connect to him.
After you get that information, login to linuxmce.org and run this command to connect:
# rassh -i <INSTALLATION_NO>
To get a user/pass for linuxmce.org, you'll need to talk to Daniel K.