Tried that -- I think.
I disabled the firewall by simply entering:
service iptables stop
Then tried it again with the same results. (I can disable the firewall safely since everything I am doing is behind our firewall.)
I disable 1 and 2 by:
login as larry (and moe, who are :1 and :2 respectively) and
'vncserver -kill :1' and 'vncserver -kill :2'
When I do that and try to connect with :1 or :2, I get a "connection is closed unexpectedly" type of popup message. When I attempt with :3 or :4, I get "Attempting to connect to host" and "Unable to connect to host: Connection refused (10061)" type of popups with RealVNC.
Any more ideas?