[SSSD-users] AD computer password renewal failing

[John Beranek]

Hi,

I was just looking in our Active Directory for computer account for
CentOS 6 and 7 servers, and was surprised that the pwdLastSet value
for accounts was many months in the past.

So, I took a test CentOS 7 server and set the debug_level up to 7.
What I found was the following (redacted internal details):

(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]] [be_ptask_execute]
(0x0400): Task [EXAMPLE machine account password renewal]: executing
task, timeout 60 seconds
(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]] [child_sig_handler]
(0x1000): Waiting for child [186603].
(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]] [child_sig_handler]
(0x0020): child [186603] failed with status [3].
(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]] [read_pipe_handler]
(0x0400): EOF received, client finished
(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]]
[ad_machine_account_password_renewal_done] (0x1000): --- adcli output
start---
 * Found realm in keytab: EXAMPLE.COM
 * Found computer name in keytab: pal062-dev
 * Found service principal in keytab: cifs/srv062-dev
 * Found service principal in keytab: cifs/srv062-dev.EXAMPLE.COM
 * Using fully qualified name: srv062-dev.EXAMPLE.COM
 * Using domain name: EXAMPLE.COM
 * Calculated computer account name from fqdn: SRV062-DEV
 * Using domain realm: EXAMPLE.COM
 * Sending netlogon pings to domain controller: cldap://10.20.30.100
 * Received NetLogon info from: dc03.EXAMPLE.COM
 * Wrote out krb5.conf snippet to
/tmp/adcli-krb5-UWvCeO/krb5.d/adcli-krb5-conf-9dw0Is
 ! Couldn't get kerberos ticket for machine account: SRV062-DEV:
Keytab contains no suitable keys for SRV062-DEV$@EXAMPLE.COM
adcli: couldn't connect to EXAMPLE.COM domain: Couldn't get kerberos
ticket for machine account: SRV062-DEV: Keytab contains no suitable
keys for SRV062-DEV$@EXAMPLE.COM
---adcli output end---
(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]] [be_ptask_done]
(0x0400): Task [EXAMPLE machine account password renewal]: finished
successfully
(Thu Aug 23 17:57:45 2018) [sssd[be[EXAMPLE]]] [be_ptask_schedule]
(0x0400): Task [EXAMPLE machine account password renewal]: scheduling
task 60 seconds from last execution time [1535043525]

The server's keytab has:

Keytab name: FILE:/etc/krb5.keytab
KVNO Timestamp           Principal
---- ------------------- ------------------------------------------------------
  23 03/15/2018 09:59:33 srv062-dev$@EXAMPLE.COM
  23 03/15/2018 09:59:33 srv062-dev$@EXAMPLE.COM
  23 03/15/2018 09:59:33 srv062-dev$@EXAMPLE.COM
  23 03/15/2018 09:59:33 srv062-dev$@EXAMPLE.COM
  23 03/15/2018 09:59:33 srv062-dev$@EXAMPLE.COM
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]
  23 03/15/2018 09:59:33 cifs/[e-mail]

Any ideas what could be wrong? Is it potentially because the keytab
has srv062-dev$ and not SRV062-DEV$ ?

Cheers,

John