Fedora :: Access A Remote Computer By Tunnelling VNC Through Ssh?

I'm trying to access a remote computer by tunnelling VNC through ssh. I've used VNC for years, but never through ssh. Both computers are running Fedora 14, installed by me. Doing a general Internet search, I found three articles, and they all had basically the same instructions. However, they don't seem to work. Here's what I did. Call my local computer "computer A," and the remote computer "computer B." I installed vncserver on B using yum:

(1) yum install tigervnc-server
(2) Then on B I started the server:

vncserver The first time you do this, you're asked to set up a password. Everything else was automatic. I did nothing to /etc/sysconfig/vncservers.

(3) With vncserver running on B, on A I issued the following command:

ssh -L 5901:localhost:5901 username-on-B@IP-address-for-B After giving the password, this logged me into a terminal session on B.

(4) At that prompt on B, I issued this command:

vncviewer localhost:1 According to the tutorials I found, this is the last step. The desktop window on B should open. It does not work. The following error was given: vncviewer: unable to open display "" What am I doing wrong? How does one tunnel VNC through ssh?