I have try to setup link via nxclinet 1.5.0-138 (MSWidnows) and server 
with freenx-0.4.4-1 and nxserver v1.5.0-4 on FC 4.
I have try with different VNCServer but without success. When I have use 
x11vnc I have received more information on screen about problem setup 
link vnc session via nxclinet:

When I have setup link to VNCServer from nxclinet I have on screen 
messasage:

The login to VNC server failed. Please check the username and password 
you provided and retry.

on VNCServer screen when I have start x11vnc maessage:

13/01/2006 17:40:04 Got connection from client 192.168.1.1
13/01/2006 17:40:04   other clients:
13/01/2006 17:40:04 Disabled X server key autorepeat.
13/01/2006 17:40:04   to force back on run: 'xset r on' (3 times)
13/01/2006 17:40:04 created xdamage object: 0x2e0002d
13/01/2006 17:40:04 Protocol version 3.3
13/01/2006 17:40:04 authProcessClientMessage: authentication failed from 
192.168.1.1
13/01/2006 17:40:04 rfbAuthProcessClientMessage: password check failed
13/01/2006 17:40:04 client_count: 0
13/01/2006 17:40:04 Restored X server key autorepeat to: 1
13/01/2006 17:40:04 connect_once: invalid password or early disconnect.
13/01/2006 17:40:04 connect_once: waiting for next connection.
13/01/2006 17:40:04 Client 192.168.1.1 gone
13/01/2006 17:40:04 Statistics:
13/01/2006 17:40:04   framebuffer updates 0, rectangles 0, bytes 0
13/01/2006 17:40:04 destroyed xdamage object: 0x2e0002d

it is look that nxclient has problem with pass correct password to 
nxviewer and next to vnc server because when I have
setup session to X Windows via nxclinet and from this computer run 
vncviewer start session to VNCServer all work OK

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