The machines passwords do change, but there are just a couple machines that seem to be
having this problem so far. The default for AD machine accounts is to change passwords
every 30 days, so I have to think there is something going on with this machine that it is
losing its trust with the AD realm.
-----Original Message-----
From: sssd-users-bounces(a)lists.fedorahosted.org
[mailto:sssd-users-bounces@lists.fedorahosted.org] On Behalf Of Sumit Bose
Sent: Tuesday, October 20, 2015 5:23 AM
To: End-user discussions about the System Security Services Daemon
<sssd-users(a)lists.fedorahosted.org>
Subject: Re: [SSSD-users] Weird keytab issue
On Tue, Oct 20, 2015 at 09:41:16AM +0200, Sumit Bose wrote:
On Tue, Oct 20, 2015 at 09:19:31AM +0200, Jakub Hrozek wrote:
> On Mon, Oct 19, 2015 at 08:18:39PM +0000, Thackeray, Neil L wrote:
> > I'm encountering a strange problem on some of my Ubuntu 14.0.4 LTS servers.
I have yet to encounter the same problem on any of the CentOS or RHEL6/7 servers.
> >
> > After a few days of working fine, all of the sudden users can't log in. I
can fix the problem easily by using 'realm leave' and 'realm join', but
this isn't optimal since users can go a day or two before it gets fixed. I thought at
first it was clock drift causing a problem with the Kerberos ticket, but this last time I
made sure to check the date before I rejoined the realm.
> >
> > Oct 19 10:16:30 myserver [sssd[ldap_child[19092]]]:
> > Preauthentication failed Oct 19 10:16:31 myserver [sssd[ldap_child[19093]]]:
Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication
failed. Unable to create GSSAPI-encrypted LDAP connection.
> >
> > sssd 1.12.5
>
> Preauthentication failed normally means wrong password, in this case
> wrong keytab. I guess you would see the same error if you run kinit
> -k "SHORTNAME$" (you can see the shortname in ldap_child.log as
> well..)
>
> Are you sure your domain policies don't expire machine passwords
> after some time?
I'm pretty sure there is a domain policy active which forces the
clients to renew their password regularly and
https://fedorahosted.org/sssd/ticket/1041 would be the related ticket
for the. Until this is fixed it might help to run msktutil from a
cronjob.
It looks like Ubuntu 14.0.4 has a packaged version of msktutil. I created a copr repo with
a quite recent release at
https://copr.fedoraproject.org/coprs/sbose/msktutil/ .
So far I didn't run any tests with those packages so any feedback is welcome.
bye,
Sumit
HTH
bye,
Sumit
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