UmbracoCustomOwinStartup.Configuration.cs

UmbracoCustomOwinStartup.Configuration.cs

public override void Configuration(IAppBuilder app)
{
    //Configure the Identity user manager for use with Umbraco Back office

    // *** EXPERT: There are several overloads of this method that allow you to specify a custom UserStore or even a custom UserManager!            
    app.ConfigureUserManagerForUmbracoBackOffice(
        ApplicationContext.Current,
        //The Umbraco membership provider needs to be specified in order to maintain backwards compatibility with the 
        // user password formats. The membership provider is not used for authentication, if you require custom logic
        // to validate the username/password against an external data source you can create create a custom UserManager
        // and override CheckPasswordAsync
        MembershipProviderExtensions.GetUsersMembershipProvider().AsUmbracoMembershipProvider());

    // Due to a problem with the cookie management caused by OWIN and ASP.NET we need to use this KentorOwinCookieSaver as described here: https://stackoverflow.com/a/26978166/465509
    // If this isn't used, the external login will seemingly randomly stop working after a while.
    app.UseKentorOwinCookieSaver();

    //Ensure owin is configured for Umbraco back office authentication
    base.Configuration(app);

    // Configure additional back office authentication options            
    ConfigureBackOfficeAdfsAuthentication(app);
}