[FreeNX-kNX] Authentication failure

[Yang]

Hi, I followed this tutorial:

http://fedoranews.org/contributors/rick_stout/freenx/

I just yum-installed freenx on an up-to-date FC5, and I can ssh in as
user nx from my client machine just fine, but my NX client is not
working. The client is from
http://www.nomachine.com/download-client-windows.php. It simply says
"Authentication failed for user bob" (the Details button is grayed
out).

My nxserver.log is empty and my secure.log recorded:

Code:
Aug 10 01:49:13 harvard sshd[27262]: Accepted publickey for nx from
18.250.6.198 port 4224 ssh2
Aug  9 21:49:13 harvard sshd[27261]: Accepted publickey for nx from
18.250.6.198 port 4224 ssh2
Aug  9 21:49:13 harvard sshd[27263]: pam_unix(sshd:session): session
opened for user nx by (uid=0)
Aug  9 21:49:14 harvard sshd[27310]: refused connect from
::ffff:127.0.0.1 (::ffff:127.0.0.1)
Aug  9 21:49:19 harvard sshd[27263]: pam_unix(sshd:session): session
closed for user nx

Please help, thanks in advance.