VNC viewer connection on Debian / Ubuntu (in this case to connect to a Dell server with iDRAC)

Install ssvncviewer:
sudo apt-get install ssvnc

Create a password file:
sudo apt-get install vnc4server
sudo apt-get remove vnc4server

Launch the viewer toward a blade with iDRAC7:
With 85% screen size:
ssvncviewer -scale 0.85 -passwd ~/.vnc/passwd

With 100% screen size:
ssvncviewer -scale 1.00 -passwd ~/.vnc/passwd