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problem starting SSL/TLS

I have openldap-2.2.13-4 running on redhat ES4. I am able to start and use my ldap server with no problems until I try to start SSL/TLS. I uncomment the lines in slapd.conf for TLS:

# Certificate entries:
TLSCipherSuite HIGH:MEDIUM:+SSLv3
TLSCACertificateFile /etc/openldap/cacert.pem
TLSCertificateFile /etc/openldap/server_cert.pem
TLSCertificateKeyFile /etc/openldap/server_cert.pem
TLSVerifyClient never

Then, my ldap server does not start. I receive the following errors in /var/log/messages:

Mar 10 07:51:07 a7470 slapd[32557]: sql_select option missing
Mar 10 07:51:07 a7470 slapd[32557]: auxpropfunc error no mechanism available

If I comment those TLS lines out again, the server starts up with no errors.

The directory "/etc/openldap" contains nothing but those certificates. Here is a directory listing:

drwxr-xr-x   3 ldap ldap  4096 Mar 10 07:37 .
drwxr-xr-x  77 root root 12288 Mar  9 20:55 ..
-rw-r--r--   1 ldap ldap  2078 Mar 10 07:37 server_cert.pem
-rw-r--r--   1 ldap ldap  1411 Mar 10 07:37 cacert.pem

Any help would be appreciated!
--
Karen R MCArthur, systems administrator
Bates College, Lewiston, Maine
kmcarthu@bates.edu

************************
My full Slapd.conf file:
************************
include         /usr/local/etc/openldap/schema/core.schema
include         /usr/local/etc/openldap/schema/cosine.schema
include         /usr/local/etc/openldap/schema/inetorgperson.schema
include         /usr/local/etc/openldap/schema/eduperson-200412.schema
include         /usr/local/etc/openldap/schema/nis.schema
include         /usr/local/etc/openldap/schema/krb5-kdc.schema
include         /usr/local/etc/openldap/schema/localeduperson.schema
include         /usr/local/etc/openldap/schema/misc.schema
include         /usr/local/etc/openldap/schema/sendmail.schema
include         /usr/local/etc/openldap/schema/meetingmaker.schema

# Allow LDAPv2 for Mozilla address books
allow bind_v2

# Remove idle connections
idletimeout 14400

# Limit number of search results to prevent trolling of directory
# by spammers, etc.
sizelimit       10

pidfile         /usr/local/var/run/slapd.pid
argsfile        /usr/local/var/run/slapd.args

# Sample security restrictions
#       Require integrity protection (prevent hijacking)
#       Require 112-bit (3DES or better) encryption for updates
#       Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64
#security simple_bind=64

#SASL configuration
sasl-realm      KRB5.EXAMPLE.COM
sasl-host       krb.example.com
sasl-secprops   noactive,noanonymous
sasl-regexp
        uid=Replicator,cn=krb.example.com,cn=gssapi,cn=auth
        cn=Replicator,dc=example,dc=com
sasl-regexp
        uid=(.*),cn=krb.example.com,cn=gssapi,cn=auth
        uid=$1,ou=People,dc=example,dc=com

# Certificate entries:
#TLSCipherSuite HIGH:MEDIUM:+SSLv3
#TLSCACertificateFile /etc/openldap/cacert.pem
#TLSCertificateFile /etc/openldap/server_cert.pem
#TLSCertificateKeyFile /etc/openldap/server_cert.pem
#TLSVerifyClient never

#######################################################################
# database definition
#######################################################################

database        bdb
suffix          "dc=example,dc=com"
rootdn          "cn=Manager,dc=example,dc=com"

directory       /usr/local/var/openldap-data

cachesize       5000
checkpoint      512     720

# replication directives
replogfile /var/log/slapd.replog

replica host=krb.example.com:714
        bindmethod=sasl
        saslmech=GSSAPI
        realm=KRB5.EXAMPLE.COM
        authcID=Replicator

replica host=krb.example.com:389
        bindmethod=sasl
        saslmech=GSSAPI
        realm=KRB5.EXAMPLE.COM
        authcID=Replicator
        suffix="ou=People,dc=example,dc=com"

# Indices to maintain
index   objectClass     eq

limits group="cn=LDAPadmins,ou=LDAPauth,dc=example,dc=com" size=-1

access to attr=userPassword
        by dn="cn=Replicator,dc=example,dc=com" write
        by group.exact="cn=LDAPadmins,ou=LDAPauth,dc=example,dc=com" write
        by dn.regex="uid=ldapadm.+\+(realm=KRB5\.EXAMPLE\.COM)" write
        by anonymous auth
        by * none

access to *
        by dn="cn=Replicator,dc=example,dc=com" write
        by group.exact="cn=LDAPadmins,ou=LDAPauth,dc=example,dc=com" write
        by dn.regex="uid=ldapadm.+\+(realm=KRB5\.EXAMPLE\.COM)" write
        by * none

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