For apache, to enforce group member restriction follow below syntax.
AuthLDAPURL
ldap://ldap.airius.com/o=Airius?uid
Require group cn=Administrators, o=Airius
Yours should be:
ldap://10.209.22.65:389/ou=People?uid
Require group cn=IT, ou=shared,ou=people,dc=ldapser,dc=com
More examples and explanation here:
http://httpd.apache.org/docs/2.0/mod/mod_auth_ldap.html
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Thanks,
Prashanth