filter,
			[]string{}, // only need DN, so pass no attributes here
			nil,
		)

		searchResult, err := conn.Search(searchRequest)
		if err != nil {
			// Object does not exist error?
			if ldap.IsErrorWithCode(err, 32) {
				ndn, err := ldap.ParseDN(dn)
				if err != nil {
					return nil, err
				}
				nonExistentUsers = append(nonExistentUsers, ndn.String())
				continue
			}
			return nil, err
		}