Active Directory authentication fails with error 'Back end is offline' on RHEL6

Solution In Progress - Updated -

Issue

After applying patches Active Directory is broken and authentication fails with the below error messages. We are not sure what's causing this failure, if you could help us figure out the root cause it would be great.

(Fri Apr 17 15:05:17 2015) [sssd[be[domain.com]]] [sasl_bind_send] (0x0100): Executing sasl bind mech: gssapi, user: HOST1$
(Fri Apr 17 15:05:17 2015) [sssd[be[domain.com]]] [sasl_bind_send] (0x0020): ldap_sasl_bind failed (-2)[Local error]
(Fri Apr 17 15:05:17 2015) [sssd[be[domain.com]]] [sasl_bind_send] (0x0080): Extended failure message: [SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure.  Minor code may provide more information (Cannot find KDC for requested realm)]

Environment

Red Hat Enterprise Linux 6.6

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