Forum Moderators: mack
The first thing to check is to be sure that the noindex,nofollow pages are *not* Disallowed in robots.txt; You must allow them to fetch the page so that they can read that on-page meta-tag.
But if that's all in order, then I'd say either serve them a blank page or redirect them, but don't complain in any way that would allow them to identify your site.
Jim