so, when you do

ssh -L5901:localhost:5901 user@targetIP

you are connecting to your home computer at "targetIP" and at the same time have created a tunnel. This tunnel makes it so that connecting to your local computer (presumable Nokia), port 5901 will get forwarded to "localhost" port 5901 on the remote end (hence, the comptuer you logged into via ssh).

Now, in VNC, you have to connect to the _NOKIA_ via "localhost", to VNC server :1 (the VNC server gets added to 5900 so this is in effect port 5901)

Martin