Strange problem: VNC Server won't start only on 3 and 4

[Murari, Tam (T.A.)]

Hello
 
For some reason vncserver :3 and vncserver :4 will not start.  It gives an error "A VNC server is already running as :3".  I checked for Xvnc processes but there is nothing running in 3 and 4.
 
I am running vnc on solaris 2.8.
 
Do I have to clean up files that are left over from a previous abrupt shutdown etc?
 
Thanks