Operations Error in ldap_search_s()

Hi,
I am badly stuck... Need help...

We have a ldap database of 500+ subscribers.
The dn to search for a particular subscriber (say, 918011111) is
"dn:subs-id=918011111,oc=subscriber,vid=3,sid=1,dc=ssdb".

The attribute structure of subs-id is
attributetype ( 1.3.6.1.4.1.4203.667.1.05
NAME 'subs-id'
DESC 'subscriber ID '
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{32}
SINGLE-VALUE
)


The problem is, if i have a subs-id which is >15 of length (say, 918012345678999), the ldap_search_s() fails with "Operations Error". But if I use the simple ldapsearch command (for the same subs-id) from my shell prompt the search results success.

My rootdn is "vid=3,sid=1,dc=ssdb".

If I just by-pass the error (Not handling the error in my code), all the subsequent search fails.

I am using the ldap bind with proper authentication (user-id/password)

My story have another twist, my loglevel directive in slapd.conf is not effective. I am not even able to find out the reason for Operations Error in subs-id >15 of length.

The ldap version i use is " $OpenLDAP: pkg/ldap/servers/slapd/slapd.conf,v 1.8.8.7 2001/09/27 20:00:31 kurt Exp $"