samba - Oct 2004 - Samba Session Error

Hi,

I'm seeing the following error when I tried to access shared home folder 
on samba.

[2004/09/30 11:35:30, 0] auth/pampass.c:smb_pam_error_handler(73)
   smb_pam_error_handler: PAM: session setup failed : Permission denied
[2004/09/30 11:35:30, 1] smbd/session.c:session_claim(124)
   pam_session rejected the session for ARKDOM/nzhang [smb/1769/100]
[2004/09/30 11:35:30, 1] smbd/password.c:register_vuid(248)
   Failed to claim session for vuid=100

Everything seems to be fine though. Googling does give me anything. I'm 
using LM10.0 with 3.0.2a. Could someone please give me some pointers?

Regards,
Norman

# wbinfo -t
checking the trust secret via RPC calls succeeded
# wbinfo -g
Domain Admins
Domain Guests
Domain Users
# wbinfo -u
arkonmailadmin
domainadmin
ekwong
Guest
nzhang
sxu
# getent passwd nzhang
nzhang:x:10009:10006::/home/ARKDOM/nzhang:/bin/bash

[global]
     workgroup = ARKDOM
     server string = Samba Server %v
     security = DOMAIN
     obey pam restrictions = Yes
     password server = EXCH5
     log file = /var/log/samba/log.%m
     max log size = 50
     socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
     os level = 18
     preferred master = No
     local master = No
     domain master = No
     dns proxy = No
     ldap ssl = no
     idmap uid = 15000-20000
     idmap gid = 15000-20000
     template shell = /bin/bash
     winbind separator = /
     winbind use default domain = Yes

[homes]
     comment = Home Folders
     path = %H
     read only = No
     browseable = No