Do you mean something like that?

ldapsearch -QY EXTERNAL -H ldapi:///
ldap_sasl_interactive_bind_s: Authentication method not supported (7)
additional info: SASL(-4): no mechanism available: 

Thanks.

> Date: Tue, 19 Feb 2013 18:34:32 -0800
> From: quanah@zimbra.com
> To: asabatgirl@hotmail.com; openldap-technical@openldap.org
> Subject: RE: modifying cn=config - Invalid credentials (49)
>
>
> --On Wednesday, February 20, 2013 1:28 PM +1100 Asmaa Ahmed
> <asabatgirl@hotmail.com> wrote:
>
> >
> > yes, but how can I modify the configuration now?
> > I can add users for instance, but I can't modify cn=config!
> >
> >
> > ldapadd -v -x -D 'cn=admin,dc=domain,dc=com' -W -f sasl-config.ldif
> >
> > modifying entry "cn=config"
> > ldap_modify: Insufficient access (50)
>
> You need to do a SASL/EXTERNAL bind using your rootdn as the root user on
> the system.
>
> --Quanah
>
>
> --
>
> Quanah Gibson-Mount
> Sr. Member of Technical Staff
> Zimbra, Inc
> A Division of VMware, Inc.
> --------------------
> Zimbra :: the leader in open source messaging and collaboration