Cookies still exist after logoff also .
Case 1) When we logoff our mail portal and then logon with another url(subportal) then automatically user is loginto system with that existing cookies .
Case 2) For another subportal url , it is not login automatically and it is asking userid and password.
When we traced cookies,
In Case 1 , cookies(MYSAPSSO2) didnt expire after logoff
Case 2 , Cookies (MYSAPSSO2) expired after logoff.
Provide me inputs to clear /terminate cookies after logoff automatically for case 1.
In the logoff java script you may have to add the functionality to delete the cookie.
Check out the following URL
Area under "A function to delete a cookie" got example scripts