GAL is configured for a domain. Everything seems to be fine and sometimes the address query is successful. But most of the time, the gal query fails with following message

method: SearchGalRequest
msg: system failure: ldap search failed
code: service.FAILURE
detail: soap:Receiver
trace: btpool0-1686://192.168.10.178/service/soap/SearchGalRequest:1363245945507:50f5861c2ce65ef5
request:

Body: {
SearchGalRequest: {
_jsns: "urn:zimbraAccount",
limit: 50,
name: ".",
offset: 0,
sortBy: "nameAsc",
type: "account"
}
},
Header: {
context: {
_jsns: "urn:zimbra",
account: {
_content: "anupama@xxx.lk",
by: "name"
},
authToken: "(removed)",
notify: {
seq: 1
},
session: {
_content: 111519,
id: 111519
},
userAgent: {
name: "ZimbraWebClient - FF3.0 (Win)",
version: "6.0.4_GA_2038.RHEL5"
}
}
}

Following details are for your reference.

[root@xxx ~]# su - zimbra -c "zmprov gds anupama@xxx.lk"
# name ExternalGAL
# type gal
objectClass: zimbraDataSource
objectClass: zimbraGalDataSource
zimbraCreateTimestamp: 20130314084415Z
zimbraDataSourceEnabled: TRUE
zimbraDataSourceFolderId: 4528
zimbraDataSourceId: 2c8f9c34-d3fd-401e-a1bd-4326c8a4a2c4
zimbraDataSourceName: ExternalGAL
zimbraDataSourceType: gal
zimbraGalLastFailedSyncTimestamp: 20130314111819Z
zimbraGalStatus: enabled
zimbraGalType: ldap

# name _ExternalGAL
# type gal
objectClass: zimbraDataSource
objectClass: zimbraGalDataSource
zimbraCreateTimestamp: 20130315045211Z
zimbraDataSourceEnabled: TRUE
zimbraDataSourceFolderId: 4529
zimbraDataSourceId: 20d16905-ebc0-4d96-93f4-01d3401e537e
zimbraDataSourceName: _ExternalGAL
zimbraDataSourcePollingInterval: 1d
zimbraDataSourceType: gal
zimbraGalLastFailedSyncTimestamp: 20130315045308Z
zimbraGalStatus: enabled
zimbraGalType: ldap

[root@xxx ~]# su - zimbra -c "zmprov gd xxx.lk | grep -i gal"
zimbraGalAccountId: 4c4033f2-df77-4483-8d18-8c19ae99ca2d
zimbraGalAutoCompleteLdapFilter: (|(cn = %s*)(sn=%s*)(gn=%s*)(mail=%s*))
zimbraGalInternalSearchBase: DOMAIN
zimbraGalLdapAttrMap: co=workCountry
zimbraGalLdapAttrMap: company=company
zimbraGalLdapAttrMap: description=notes
zimbraGalLdapAttrMap: displayName,cn=fullName
zimbraGalLdapAttrMap: givenName,gn=firstName
zimbraGalLdapAttrMap: initials=initials
zimbraGalLdapAttrMap: l=workCity
zimbraGalLdapAttrMap: objectClass=objectClass
zimbraGalLdapAttrMap: ou=department
zimbraGalLdapAttrMap: physicalDeliveryOfficeName=office
zimbraGalLdapAttrMap: postalCode=workPostalCode
zimbraGalLdapAttrMap: sn=lastName
zimbraGalLdapAttrMap: st=workState
zimbraGalLdapAttrMap: street,streetAddress=workStreet
zimbraGalLdapAttrMap: telephoneNumber=workPhone
zimbraGalLdapAttrMap: title=jobTitle
zimbraGalLdapAttrMap: whenChanged,modifyTimeStamp=modifyTimeStamp
zimbraGalLdapAttrMap: whenCreated,createTimeStamp=createTimeStamp
zimbraGalLdapAttrMap: zimbraCalResLocationDisplayName=zimbraCalResLocati onDisplayName
zimbraGalLdapAttrMap: zimbraCalResType=zimbraCalResType
zimbraGalLdapAttrMap: zimbraId=zimbraId
zimbraGalLdapAttrMap: zimbraMailDeliveryAddress,zimbraMailAlias,mail=ema il,email2,email3,email4,email5,email6,email7,email 8,email9,email10,email11,email12,email13,email14,e mail15,email16
zimbraGalLdapAttrMap: zimbraMailForwardingAddress=zimbraMailForwardingAd dress
zimbraGalLdapFilter: (|(cn = %s*)(sn=%s*)(gn=%s*)(mail=%s*))
zimbraGalLdapPageSize: 1000
zimbraGalLdapSearchBase: O=ual
zimbraGalLdapURL: ldap://192.168.10.65:389
zimbraGalMaxResults: 1000
zimbraGalMode: ldap
zimbraGalSyncLdapPageSize: 1000
zimbraGalSyncTimestampFormat: yyyyMMddHHmmss'Z'

How can we get addresses from GAL sync account? Autocomplete also get failed.

Force sync command finish successfully but I found no addresses in the address book of GAL sync account.
zmgsautil forceSync -a anupama@xxx.lk -n ExternalGAL

I went through this document GAL Sync Account - Zimbra :: Wiki
My zimbra version is zcs-6.0.4_GA_2038.RHEL5

How can I properly configure GAL with external ldap service and sync same with a local galsync account. Address query should be pointed to galsync account.

Thanks