ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
this might be due to slapd's apparmor profile. Runaa-complain slapd
and try again to verify. If this helps, you should dig into your apparmor profile In any case, make sure to re-enforce with
aa-enforce slapd
/etc/init.d/slapd stop
/etc/init.d/slapd start
Only leave it in complain mode (on your own responsibility), if you know what you're doing