Hello,
Actually I only added kerberos authentication for sasl.
In '/etc/ldap/sasl2/slapd.conf', I added only  mech_list: GSSAPI
Can I add other mechanisms too?

ldapsearch -x -H ldapi:// -b '' -s base -LLL supportedSASLMechanisms
dn:
supportedSASLMechanisms: GSSAPI

Thanks.

> Date: Tue, 19 Feb 2013 22:31:34 -0600
> From: dwhite@olp.net
> To: asabatgirl@hotmail.com
> Subject: Re: modifying cn=config - Invalid credentials (49)
> CC: openldap-technical@openldap.org
>
> On 02/20/13 13:45 +1100, Asmaa Ahmed wrote:
> >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.
>
> You have likely misconfigured sasl, via your sasl slapd.conf file.
>
> Within that file, comment out your 'mech_list' option, or add 'EXTERNAL' to
> it.
>
> --
> Dan White
>