c# - Login url gets changed on redirection with authorize attribute -

i using owin custom authentication , asp.net identity , have login url this:

http://localhost:1927/ 

now after login user redirected dashboard page , url this:

http://localhost:1927/dashboard/index 

now after user logout redirecting user login page , url still fine below:

http://localhost:1927/

but when enter url http://localhost:1927/dashboard/index directly in browser again redirecting login page , url changes below url:

http://localhost:1927/authentication/login?returnurl=%2fdashboard%2findex 

i know because have decorated both authentication , dashboard controller authorize attribute.

code:

[authorize]     public class authenticationcontroller : controller     {      }       [authorize]     public class dashboardcontroller : controller     {      }  public partial class startup     {         // more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?linkid=301864         public void configureauth(iappbuilder app)         {             // enable application use cookie store information signed in user             app.usecookieauthentication(new cookieauthenticationoptions             {                 authenticationtype = defaultauthenticationtypes.applicationcookie,                 loginpath = new pathstring("/authentication/login")             });             // use cookie temporarily store information user logging in third party login provider             app.useexternalsignincookie(defaultauthenticationtypes.externalcookie);         }     } 

web.config:

 <authentication mode="none" />    <modules>       <remove name="formsauthenticationmodule" />   </modules> 

so possible have url below on redirecting login page:

http://localhost:1927/ 

if yes how??