vb.net - Session variables not clearing after Session.Clear() and Session.Abandon() in ASP.NET -


after running penetration tests on our site, our security pointed out session id's on our server doesn't cleared out after users log out.

our code clear session follows:

session.clear() session.removeall() session.abandon()  dim cookie1 httpcookie = new httpcookie(formsauthentication.formscookiename, "") cookie1.expires = datetime.now.addyears(-1) response.cookies.add(cookie1)  dim cookie2 httpcookie = new httpcookie("asp.net_sessionid", "") cookie2.expires = datetime.now.addyears(-1) response.cookies.add(cookie2)  formsauthentication.signout() formsauthentication.redirecttologinpage()

we confirmed having usera log in , forging cookies based on login. after usera logs out, log in userb , expected, acquired session values stored in usera's sessionid.

is there other way clear session data?

as per msdn, session.clear , session.removeall same thing. need call before call clear:

system.web.security.formsauthentication.signout()

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