I was attempting to join my RHEL5 x86_64 machine to LDAP when I received the following error:

[2009/06/01 18:52:39, 0] libads/kerberos.c:create_local_private_krb5_conf_for_domain(651)
create_local_private_krb5_conf_for_domain: failed to create directory /var/cache/samba/smb_krb5. Error was Permission denied

Umm.. okay, fine, I created the directory smb_krb5  under /var/cache/samba/and problem solved. Not sure, if this is a bug but here is what I have installed: samba-client-3.0.28-0.el5.8 and samba-common-3.0.28-0.el5.8.

Go figure...