I've been asking this request, but I can't seem to find a relevant answer...
I need to implement a custom sign-in page for external users and internal users (SharePoint 2013).
I enabled and congigured the FBA in order to be able to set a custom sign-in page. However, my bosses don't want the users to use FBA at all, but stick to windows authentication only : they want the user to type his windows DOMAIN\username and password, and then get access to the SharePoint site. But when I use the windows authentication option, should I be authorized to access the site, I'm automatically logged-in.
Is there a way to bypass this behaviour, to force the user to type in his windows username + password ?