errorcode - Administrative limit exceeded

Hi,

I have created a test client program using LDAP C SDK 5.12, to
retrieve data from iPlanet Directory Server 5.1.

I am using asynchronous function call ldap_search_ext with NULL
timeout and 0 sizelimit. In continuation I am trying to get results
using ldap_result with LDAP_MSG_ALL keeping various values of timeout.
I was getting error "sizelimit exceeded" for search result more tan
2000. After setting nsslapd-sizelimit to a larger value I am able to
retrieve 5000 entries accompanied by error "Administrative limit
exceeded".

Please let me know underlying reason for it. If there is any
configuration parameter to be set to a higher value?

Also when I set timelimit to some finite value less than time required
to fetch all results for any query, what will be the response of
ldap_result with parameter LDAP_MSG_ALL?

Any suggestion in this regard will be highly appreciated.

Thanks
Bhawna