Resolution:
**Error**
Exception while testing search parameters([dc=xilinx,dc=com], [objectclass=person])
: netscape.ldap.LDAPException: error result (11);
********

The above exception corresponds to a result code of 11. In the Netscape Directory Server 3.0, this corresponds
to the "look through limit" for the server. This is the maximum number of entries that the server will check
through when determining which entries match the search filter and scope.

Means your "lookthrough limit" in your Directory Server was exceeded. You need to increase that.

Please use the below reference and try tuning the lookthoughlimit here.

http://www.codefund.com/502/error-opening-fileurl-reference-by-alias-and-administrative-limit-exceeded-5023068.shtm
http://library.n0i.net/netscape/directory/ne-sdkprog3/exceptns.htm#2833795

LDAP Exception while testing search parameters: