How to disable referrals when proxy windows AD?

[JWD <j-wd@163.com>]

I config a proxy cache, using windows AD as backend.

When I run ldapsearch, it always search reference for minuts, like this:
# search reference
ref: ldap://ForestDnsZones.test.com/DC=ForestDnsZones,DC=test,DC=com
# search reference
ref: ldap://DomainDnsZones.test.com/DC=DomainDnsZones,DC=test,DC=com
# search reference
ref: ldap://test.com/CN=Configuration,DC=test,DC=com

Infact, there is no reference at all.
How to disable proxy cache referrals?

Below is my proxy cache config:

database        ldap
suffix          "dc=test,dc=com"
uri             ldap://192.168.127.15/
#uri             ldap://192.168.127.15/dc=test,dc=com
rootdn          "cn=root,dc=test,dc=com"
rootpw          {SSHA}Hpc7nbJEdos8iCUAzRNa/rs5ffb0/+mD

overlay         pcache
pcache          bdb 100000 1 1000 100
#pcacheAttrset   0 name mail sAMAccountName telephonenumber
pcacheAttrset   0 name mail telephonenumber
pcacheTemplate  (cn=) 0 3600
pcacheTemplate  (&(sn=)(givenName=)) 0 3600
pcacheTemplate  (&(departmentNumber=)(secretary=*)) 0 3600

directory       /var/lib/ldap/test

CacheSize       1000
DNcacheSize     2000
IDLcacheSize    3000
CacheFree       10
Checkpoint      1024 10

DbConfig        set_cachesize 0 104857600 1
DbConfig        set_data_dir db
DbConfig        set_lg_dir logs
DbConfig        set_lg_regionmax 1048576
DbConfig        set_lg_max 20971520
DbConfig        set_lg_bsize 2097152
DbConfig        set_flags DB_LOG_AUTOREMOVE
DbConfig        set_flags DB_TXN_NOSYNC

index objectClass                       eq,pres
index ou,cn,mail,surname,givenname      eq,pres,sub
index uidNumber,gidNumber,loginShell    eq,pres
index uid,memberUid                     eq,pres,sub
index nisMapName,nisMapEntry            eq,pres,sub
index entryCSN,entryUUID                eq,pres


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JWD