Hello,

When I have the following key in my web.config, umbraco preview is working fine, showing me the correct content but I can not login to my web site, I can login to umbraco backoffice without any problem.

When I comment out the following key, then I can login to my web site but this time umbraco preview is not showing the correct content.

What should I do to make preview work and at the same time I can login to my front end site? I have already searched for a solution, but I haven't managed to fix this so far. Any help is appreciated.

Umbraco version 7.4.3 assembly: 1.0.5948.18141

The key:

<add key="owin:appStartup" value="UmbracoDefaultOwinStartup" />

My OwinStartup class:

[assembly: OwinStartup(typeof(OwinStartup), "Configuration")]
namespace Bit10.IAA.Site
{
    public class OwinStartup : UmbracoDefaultOwinStartup
    {
        public override void Configuration(IAppBuilder app)
        {
            base.Configuration(app);

            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = "Cookies"
            });

            app.UseOpenIdConnectAuthentication(new OpenIdConnectOptions());


            app.Use((context, next) =>
            {
                var loggedInMarkerCookie = context.Request.Cookies[Settings.CookieLoggedInMarkerName];
                var autoLoginAttempt = context.Request.Cookies[Settings.CookieLoggedInMarkerAttemptName];

                if (!context.Authentication.User.Identity.IsAuthenticated && !context.Request.Path.Value.StartsWith("/sso/") && (loggedInMarkerCookie != null && autoLoginAttempt == null))
                {
                    context.Response.Cookies.Append(Settings.CookieLoggedInMarkerAttemptName, DateTime.Now.ToString(), new CookieOptions { Expires = DateTime.Now.AddMinutes(30) });
                    context.Authentication.Challenge();
                }

                return next.Invoke();
            });
        }
    }
}