I created a VF page, configured to be public under the Partner Site.
When I am not logged in anywhere, I get the page fine.
When I logged in Partner Site with some partner contact, I get the page fine.
When I logged in force.com (internal users), I get the page fine.
But, when I am logged in another Force.com Site (say for my Customers) with a customer contact, the page is not opening - I am redirected to the login page of the Partner Site.
When I am logged in Customer Portal and browse a public page of Partner Site, I want / am expecting to see the page, as a guest, because I am not logged in Partner Site. How can I make this scenario happen?
Note: I tried the other way around (public page in customer site, me logged in partner site) and got the same 401/login page response.
Both Sites are Communities having Administration/Template=Salesforce Tabs + Visualforce