vncserver on centos 5.1

[Jerry Geis]

I am running vncserver on centos 5.1
vncviewer is working into the vncserver just fine for the current 
displayed workspace.

man vncviewer says use something like "vncviewer machine:2" to connect 
to the second workspace display.
When I do this it says unable to connect to host connection refused.
Again, vncviewer machine works fine.

What configuration am I missing so I can connect directly to each 
workspace display 1-4?

THanks,

Jerry