Enable SASL and GSSAPI authentication

[Jörg Herzinger <joerg.herzinger@global2000.at>]

Hi, I've been running openLDAP with GSSAPI authentication for quite a 
while now and everything has been running quite fine. The last days I 
tried enabling SASL password auth as described in [1]
Now password authentication works fine, but it seems that GSS somehow 
has been disabled:

root@ldap1 ~ # ldapsearch -x -H ldap:// -b '' -s base -LLL 
supportedSASLMechanisms
dn:

While without SASL enabled I get:

root@ldap1 ~ # ldapsearch -x -H ldap:// -b '' -s base -LLL 
supportedSASLMechanisms
dn:
supportedSASLMechanisms: GSSAPI

Is it possible to enable both, GSS and SASL pass through auth? I checked 
the dokumentation and couldn't find a clue if it is or not.

openLDAP version is 2.4.11 on Debian Lenny, Kerberos is MIT version 1.6 
also on Lenny. Slapd config can be found here [2]

tia,
    Jörg Herzinger

[1] http://www.openldap.org/doc/admin24/security.html#Pass-Through 
authentication
[2] 
https://github.com/joerg/global2000-puppet/blob/master/modules/ldapserver/templates/etc-ldap-slapd.conf.erb