New Post: Multi site and incorrect redirection

Thanks burningice for the explanation, that is not what I am looking for

I would like to see a 404 page not found status for url www.site2.com/Site1 as there is no page Site1 in www.site2.com. Page Site1 is present only in www.site1.com.

Google search now has www.site2.com/Site1 (redirecting to www.site1.com/Site1) indexed even though there is no such page Site1 in www.site2.com