ServiceStack - Custom CredentialsAuthProvider in .Net MVC Application

I am trying to authenticate with MVC and ServiceStack following the example here - https://github.com/ServiceStack/ServiceStack.UseCases/tree/master/CustomAuthenticationMvc . My problem is that I cannot successfully authenticate with the ServiceStack on my initial Account / LogOn request.

ServiceStack related code in LogOn method of AccountController:

var apiAuthService = AppHostBase.Resolve<AuthService>();
apiAuthService.RequestContext = System.Web.HttpContext.Current.ToRequestContext();
var apiResponse = apiAuthService.Authenticate(new Auth
                                                    {
                                                        UserName = model.UserName,
                                                        Password = model.Password,
                                                        RememberMe = false
                                                    });

      

        
        
        
      

    

I have my own authentication provider that subclasses the CredentialsAuthProvider. I Configure as follows in the AppHost class:

var appSettings = new AppSettings();

Plugins.Add(new AuthFeature(() => new CustomUserSession(),
    new IAuthProvider[] {
      new ActiveDirectoryAuthProvider(), 
    })); 

      

        
        
        
      

    

public override bool TryAuthenticate(ServiceStack.ServiceInterface.IServiceBase     authService, string userName, string password)
{
    //class to authenticate against ActiveDirectory        
    var adAuthentication = new ActiveDirectoryAuthenticationService();

    if (!adAuthentication.Authenticate(userName, password))
            return false;

    var session = (CustomUserSession)authService.GetSession(false);
    session.IsAuthenticated = true;
    session.UserAuthId = session.UserAuthName;
    authService.SaveSession(session, SessionExpiry);

    return true;
}

      

        
        
        
      

    

I think my problem is that session.Id is null at the moment and saving the session continues with "urn: iauthsession:" in "SessionCache". However, I'm not sure how to fill in the session.Id correctly . Also, this may or may not be an issue, but the original LogOn request is the account / login that MVC handles. So there is no request to the ServiceStack prior to calling AuthService.Authenticate () in the AccountController.

In my subclass CredentialsAuthProvider, a possible solution I came up with was added.

public override bool TryAuthenticate(ServiceStack.ServiceInterface.IServiceBase     authService, string userName, string password)
{
    //class to authenticate against ActiveDirectory        
    var adAuthentication = new ActiveDirectoryAuthenticationService();

    if (!adAuthentication.Authenticate(userName, password))
            return false;

    var session = (CustomUserSession)authService.GetSession(false);

    //A possible solution???
    if(session.Id == null)
    {
        var req = authService.RequestContext.Get<IHttpRequest>();
        var sessId = HttpContext.Current.Response.ToResponse().CreateSessionIds(req);
        session.Id = sessId;
        req.SetItem(SessionFeature.SessionId, sessId);
    }
    //end possible solution
    session.IsAuthenticated = true;
    session.UserAuthId = session.UserAuthName;
    authService.SaveSession(session, SessionExpiry);

    return true;
} 

      

        
        
        
      

    

Is there a configuration or call I am missing to "hook up" ServiceStack authentication in MVC?

Thank.