AD users are not able to login after updating the system to RHEL 6.6.

Issue

• AD users are not able to login after updating the system to RHEL 6.6.
• Below logs can be seen in sssd domain log file.

$ grep krb5.conf sssd_example.com.log 
(Mon Feb  1 15:08:48 2016) [sssd[be[example.com]] [dp_get_options] (0x0400): Option krb5_confd_path has value /var/lib/sss/pubconf/krb5.include.d
(Mon Feb  1 15:08:48 2016) [sssd[be[example.com]]] [dp_copy_options_ex] (0x0400): Option krb5_confd_path has value /var/lib/sss/pubconf/krb5.include.d
(Mon Feb  1 15:08:48 2016) [sssd[be[example.com]]] [sss_krb5_touch_config] (0x0020): Unable to change mtime of "/etc/krb5.conf" [13]: Permission denied
(Mon Feb  1 15:08:48 2016) [sssd[be[example.com]]] [sss_write_krb5_conf_snippet] (0x0020): Unable to change last modification time of krb5.conf. Created mappings may not be loaded.
(Mon Feb  1 15:08:48 2016) [sssd[be[example.com]]] [sss_krb5_touch_config] (0x0020): Unable to change mtime of "/etc/krb5.conf" [13]: Permission denied
(Mon Feb  1 15:08:48 2016) [sssd[be[example.com]]] [sss_write_domain_mappings] (0x0020): Unable to change last modification time of krb5.conf. Created mappings may not be loaded.