Thanks for all you input.
Trying the ldapsearch with -E pr(paged result) command gives the same
error
DB2-95-02:~ # ldapsearch -E '!pr=10' -x -h 10.217.94.154 -b
"dc=openldap,dc=dev,dc=net6,dc=com" -s sub '(objectclass=person)' dn
# extended LDIF
#
# LDAPv3
# base <dc=openldap,dc=dev,dc=net6,dc=com> with scope subtree
# filter: (objectclass=person)
# requesting: dn
# with pagedResults critical control: size=10
#
# search result
search: 2
result: 53 Server is unwilling to perform
text: critical control unavailable in context
Following is listing from slapd.conf file