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I have Three application viz(IdentityServer4 App, .Net Core2.0 WebApp, .NetCore2.0 WebAPI)

When I open the webapp if its un-authenticated, It gets navigated to identity server where I supply the credentials. After successful authentication it navigates back to webapp with the required cookies in place. Things are fine till here.

Now within webapp I am making calls to webapi (with cookies set by identity server in webapp) but each time it returns as 401 unauthorized.

Code sample in webapp:

services.AddAuthentication(options =>
 
 options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
 options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
 )
 .AddCookie(CookieAuthenticationDefaults.AuthenticationScheme, o =>
 
 o.Cookie.Name = Config.CookieName;
 o.Cookie.SameSite = SameSiteMode.None;
 )
 .AddOpenIdConnect(OpenIdConnectDefaults.AuthenticationScheme, options =>
 
 options.SignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;

 options.Authority = Config.IdentityUrl;
 options.RequireHttpsMetadata = false;
 options.ClientId = Config.ClientId;
 options.SaveTokens = true;
 );

And Code sample used in WebAPI in configure service method ConfigureServices:

services.AddAuthentication(options =>

 options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
 options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
)
.AddCookie(CookieAuthenticationDefaults.AuthenticationScheme, o => 
 o.Cookie.Name = Config.CookieName;
 o.Cookie.SameSite = SameSiteMode.None;
 o.Events = new CookieAuthenticationEvents()
 
 OnRedirectToLogin = redirectContext =>
 
 redirectContext.HttpContext.Response.StatusCode = StatusCodes.Status401Unauthorized;
 return Task.CompletedTask;
 
 ;
)
.AddIdentityServerAuthentication(options =>

 options.Authority = Config.IdentityUrl;
 options.RequireHttpsMetadata = false;
 options.ApiName = Config.ApiName;
);

also I have app.UseAuthentication() method in Configure method

What I get a feeling of it has to do with something session-id may be. If so it the case please help if not then what you could make out as not doing right please help.

I traced log it shows just following thing in there:

Cookie was not authenticated. Failure Message: Unprotect ticket failed.

Authentication Cookie was chanllenged.

Any help would be appreciated.

Here is the magical line of code.Added in

ConfigureServices

method before

services.AddAuthentication

This was reason because of which cookie was not getting validated.

services.AddDataProtection().PersistKeysToFileSystem(PersistKeysLocation.GetKeyRingDirInfo())
.SetApplicationName(Config.ApplicationName);