asp.net mvc 5 - Signing out External Cookies before Signing in ApplicationCookie - OWIN -

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I am currently studying the new ASPNET identity and owin authentication so that I can customize it for my own use . I just created a default MVC 5 application and it came to this part of the code 

  private async Task Sign InSync (ApplicationUser user, bool isPersistent) {AuthenticationManager.SignOut (DefaultAuthenticationTypes.ExternalCookie); /// Why?? Var identification = UserManager Wait for credentials async (user, default authentication.tap.exe); Authentication Manager Signin (new authentication credentials) (IDresistent = identifiers}, identification);

Question

Is there a security risk to leave the external cookie?

This indicates that the purpose of that line is to disable the external cookie that is available from the third party provider I went. Since the user has to transfer the identity of the user from third parties to local identity.

Not doing this keeps cookies valid even after the user is signed out.


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