Is there a way to force sharepoint 2010 to popup the dialog to ask the user for a username and password and not use the computers logged in user, if that user doesn't have access.
We need an internal sharepoint website to not use the windows credentials, since these are computers used by many people. The windows user doesn't have access to the site, so currently it shows an access denied, click here to log in as another user. We would prefer if it just asked for credentials in a more graceful manner.
Forms Based Authentication is the answer. You can modify the Login page and even where the users credentials (username/password) are stored (e.g. a SQL database rather then AD).