ASP.NET Core No authentication handler is configured to handle the scheme Cookies

June 28, 2017 by Anuraj

ASP.NET Core

This post is about ASP.NET Core authentication, which throws an InvalidOperationException - No authentication handler is configured to handle the scheme Cookies. In ASP.NET Core 1.x version, the runtime will throw this exception when you are running ASP.NET Cookie authentication. This can be fixed by setting options.AutomaticChallenge = true in the Configure method.

Here is the full code.

app.UseCookieAuthentication(options =>
{
    options.AutomaticAuthenticate = true;
    options.AutomaticChallenge = true;
});

And here is the SignIn method.

var claims = new[] 
{ 
    new Claim("name", authUser.Username)
};

var identity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
HttpContext.Authentication.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme,
    new ClaimsPrincipal(identity));

Recently I upgraded on of ASP.NET Core 1.x solution to ASP.NET Core 2.0. In ASP.NET Core 2.0, ASP.NET Core team changed the authentication methods and now there is nothing like UseCookieAuthentication. I got some compilation issues with the existing solution. Since most of the documentation it only talking about ASP.NET 1.x, I had to spent time, and I fixed it.

Here is the new Startup.cs code for authentication.

public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication(options =>
    {
        options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
        options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    });

    services.AddCookieAuthentication();
}

And in the configure method, you need to use app.UseAuthentication(); method.

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseAuthentication();
    //More code.
}

But when I am running, I got the same exception.

No authentication handler is configured to handle the scheme Cookies

After spending sometime, I figured out the issue. You don’t need to call the HttpContext.Authentication.SignInAsync method. Instead you need to call the HttpContext.SignInAsync method for authentication.

Here is the updated Signin code.

var claims = new[] 
{ 
    new Claim("name", authUser.Username)
};

var identity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme,
    new ClaimsPrincipal(identity));

Happy Programming :)

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