You need to enable the echo protocol in your system before openning this page AND edit orbited.cfg to enable connections to "localhost:7".
For example, in debian/ubuntu you can do it like this:
sudo apt-get install openbsd-inetd
sudo vim /etc/inetd.conf echo stream tcp nowait root internal
sudo invoke-rc.d openbsd-inetd restart
NB: if you're running Firefox with Firebug, look at its console.