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]]: Preauthentication failed
Oct 19 10:16:31 myserver [sssd[ldap_child]]: Failed to initialize credentials using
keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
GSSAPI-encrypted LDAP connection.