I have an MVC4 application been developed in VS2012 that uses forms authentication.
[authentication mode=\"Forms\"] [forms loginUrl=\"~/Account/Login\" timeout=\
You can edit IIS authentification modes by changing
iis properties in \My Documents\IISExpress\config\applicationhost.config
project properties in visual studio
The second option is your answer.
A full answer with screenshots is already on stackoverflow : https://stackoverflow.com/a/7168308/2988788