Domain mapping not working with Password protected pages or post

Password protected pages are not working with domain mapped sites.

Upon entering the password and clicking submit you are redirected to the Admin dashboard if logged-in. If not logged-in you are redirected to the not_found page.

Tested with default 2012 theme and redirects still occurs for mapped domains.

Tested with a non-mapped domain and it works

Also I have "https" applied to the admin back-end upon the redirect "https" is added to the mapped domain.

This don't happen to non-mapped domains