Sounds crazy but here it is.
I am trying to allow AD users to login to freebsd machine.

freebsd machine is named 'ramsgate', AD servers are 'good' and 'bad'. Domain is ld.yandex.ru.

Here is smb.conf:

=================
[global]
client use spnego = yes
workgroup = LD
password server = good.ld.yandex.ru bad.ld.yandex.ru
netbios name = RAMSGATE
security = domain
realm = LD.YANDEX.RU
disable spoolss = Yes
show add printer wizard = No
idmap uid = 15000-20000
idmap gid = 15000-20000
;winbind domain name = LD
winbind use default domain = Yes
winbind separator = \
winbind enum users = no
winbind enum groups = no
template homedir = /home/wbusers/%D/%U
template shell = /usr/local/bin/qshell
wins server = good.ld.yandex.ru
======================

for most users everything works perfectly but some of them cannot login. 

wbinfo -u lists them nice, but wbinfo -r for those users fails:

[root@ramsgate /usr/local/src/samba-3.0.23a/docs]# /usr/local/samba/bin/wbinfo -r wawa
Could not get groups for user wawa
[root@ramsgate /usr/local/src/samba-3.0.23a/docs]# /usr/local/samba/bin/wbinfo -r avk
15000
15001
...

wbinfo (and login as well) fails for all users who have 'w' in their account names. And ONLY for those users.

FreeBSD ramsgate.yandex.net 5.5-RELEASE FreeBSD 5.5-RELEASE #0: Tue May 23 14:58:27 UTC 2006     root@perseus.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

[root@ramsgate /usr/ports/net/samba3]# locale
LANG=
LC_CTYPE="C"
LC_COLLATE="C"
LC_TIME="C"
LC_NUMERIC="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_ALL=



got this problem with samba-3.0.21b in freebsd ports and compiled by me samba 3.0.23a. I get no idea what happens.