■ If IsPersistent is set to false => the browser will acquire session cookie which gets cleared when the browser is closed. Now the reason session cookie wont clear after restarting the browser is because of chrome default settings. To fix it go to chrome settings -> advanced, and uncheck Continue running background apps when Google Chrome is closed under System section.
* IsPersistent 는 브라우저 Closing될때 브라우저 폴더에 저장하여 쿠키를 삭제하지 않으므로 지속되는 것일 뿐이며,
ExpireTimeSpan 와 관련없다. 특정프로젝트에서 CookieAuthenticationOptions -> ExpireTimeSpan 을 최대기간(3년이상) 설정.