samba - Aug 2010 - Cant access to resource (FAILED with error NT_STATUS_NO_SUCH_USER) PLEASE HELP!

I configure Samba Version 3.2.5 to validate users over Windows 2003, i configure
kerberos and join successfully to the windows 2003 AD, but, when i connect to a
shared resource of the samba i have the error.....

[2010/08/13 12:38:07,  2] auth/auth.c:check_ntlm_password(318)
  check_ntlm_password:  Authentication for user [USER1] -> [USER1] FAILED
with error NT_STATUS_NO_SUCH_USER


.....i check all the config, run in debug mode and can't resolve the
problem, i think that the problem is the compatibiliti with windows.

Thanks.

Javier