Hi Randar,

To be able to login you have to have the users in the Kentico CMS’s database, you can do that manually using the UserInfoProvider and RoleInfoProvider from CMS.SiteProvider namespace. You can see the examples here: http://devnet.kentico.com/docs/devguide/managing_users.htm and here http://devnet.kentico.com/docs/devguide/managing_roles.htm

Or you can connect your own authentication handler when you authenticate against external source to do that for you: http://devnet.kentico.com/docs/devguide/security_handler.htm You shouldn’t really replace our membership provider, just connect the handler.