UMC with enabled debug level prints a lot of messages like this:
Dec 20 15:36:12 dc slapd: OVER: rs->sr_err != LDAP_SUCCESS on "ou=site1,dc=sub,dc=domain,dc=ucs" ERR: 0x20
This log snipplet means the LDAP server did not get “LDAP_SUCCESS” back when trying to access the mentioned object. It got back error code 0x20. Error code 20 (taken from here) means:
LDAP_NO_SUCH_OBJECT: Indicates the target object cannot be found. This code is not returned on following operations:
- Search operations that find the search base but cannot find any entries that match the search filter.
- Bind operations.
Check why LDAP daemon cannot access the mentioned object (ou=site1,dc=sub,dc=domain,dc=ucs).
Does the object exist? Are there any LDAP-ACLs preventing access?
There might be different error codes. Check the above site to get the meaning of your error code to get a hint for further troubleshooting.