[Samba] Winbind Problem

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Hello,

I have a Centos 4.4 Linux server that setup Winbind with windows 2003AD 
integration, the winbind suddenly can't receive AD accounts, I can use 
wbinfo -u to show AD user name and group etc, but getent passwd isn't pulling 
across all of the domain accounts. I also had another  Centos 4.4 Linux 
server running Winbind no problem with same 2003AD, the following is the
Winbind.log:

[2007/10/24 10:09:49, 1] nsswitch/winbindd_user.c:winbindd_getpwent(566)
  could not lookup domain user sfa07307
[2007/10/24 10:09:49, 1] nsswitch/winbindd_user.c:winbindd_fill_pwent(50)
  error getting user id for sid S-1-5-21-106390638-1002753184-2220938350-2579
[2007/10/24 10:09:49, 1] nsswitch/winbindd_user.c:winbindd_getpwent(566)
  could not lookup domain user sfa07306
[2007/10/24 10:09:49, 1] nsswitch/winbindd_user.c:winbindd_fill_pwent(50)
  error getting user id for sid S-1-5-21-106390638-1002753184-2220938350-2578
[2007/10/24 10:09:49, 1] nsswitch/winbindd_user.c:winbindd_getpwent(566)
  could not lookup domain user sfa07305
_user.c:winbindd_getpwent(566)
  could not lookup domain user sfa07301



Thanks !