[CentOS] Kerberos/LDAP authentication no more working in 5.6 ?

Tue Apr 12 20:29:35 UTC 2011
Alain Péan <alain.pean at lpp.polytechnique.fr>

Le 12/04/2011 22:03, John Hodrien a écrit :
> On Tue, 12 Apr 2011, Alain Péan wrote:
>> Indeed, nothing fails now. I want my users to authenticate against
>> Active directory, and it works, and I would like them to be able to use
>> their kerberos credentials, if they need, to access domain ressources,
>> as shares. But I have still to see a problem there..
>> Thanks again for your help and your comments !
> So is it all working after taking out the ldap auth?  With it in 
> you'll not be
> generating kerberos tickets if there's anything wrong with your kerberos
> setup.
> jh

No, you are right, things do not work as I expect. When I disable 
ldapauth, I cannot authenticate. So kerberos is not working.
I have kerberos error messages with samba when I try to join AD domain 
with net ads join. But net rpc join succeeds.
# net ads join -U pean -d3
[2011/04/12 22:19:45.797972,  3] libads/sasl.c:790(ads_sasl_spnego_bind)
   ads_sasl_spnego_bind: got server principal name = 
[2011/04/12 22:19:45.798331,  3] libsmb/clikrb5.c:698(ads_krb5_mk_req)
   ads_krb5_mk_req: krb5_cc_get_principal failed (No credentials cache 
[2011/04/12 22:19:45.811493,  1] libsmb/clikrb5.c:710(ads_krb5_mk_req)
   ads_krb5_mk_req: smb_krb5_get_credentials failed for 
pc-2003-test$@TEST-LPP.LOCAL (Cannot find ticket for requested realm)

Why 'no credential cache found' ?
I would like to solve this annoying problem. Why it is no more working 
after upgrading to 5.6 ?