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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/sssd/ticket/1994

The sssd_be loads the keytab on start and checks for the expected principal. In case the keytab is wrong or the principal is missing, there is no explanation with the default logging, just:
{{{
(Thu Jun 20 17:50:54 2013) [sssd[be[ipa.example.com]]] [load_backend_module] (0x0010): Error (2) in module (ipa) initialization (sssm_ipa_id_init)!
(Thu Jun 20 17:50:54 2013) [sssd[be[ipa.example.com]]] [be_process_init] (0x0010): fatal error initializing data providers
(Thu Jun 20 17:50:54 2013) [sssd[be[ipa.example.com]]] [main] (0x0010): Could not initialize backend [2]
}}}

We should make it clear that the back end didn't start due to wrong keytab.

Created attachment 1078354 [details]
Verify log for bz

Verified

sssd-1.13.0-35.el7.x86_64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-2355.html