return nil, err
			}
			nonExistentUsers = append(nonExistentUsers, ndn.String())
		}
	}
	return nonExistentUsers, nil
}

// LookupGroupMemberships - for each DN finds the set of LDAP groups they are a
// member of.
func (l *Config) LookupGroupMemberships(userDistNames []string, userDNToUsernameMap map[string]string) (map[string]set.StringSet, error) {
	conn, err := l.LDAP.Connect()
	if err != nil {

		}
		parentUserToCredsMap[cred.ParentUser] = append(parentUserToCredsMap[cred.ParentUser], cred)
	}

	// 2. Query LDAP server for groups of the LDAP users collected.
	updatedGroups, err := sys.LDAPConfig.LookupGroupMemberships(parentUserActualDNList, actualDNToLDAPUsernameMap)
	if err != nil {
		// Log and return on error - perhaps it'll work the next time.
		iamLogIf(GlobalContext, err)
		return
	}