CAS is a single sign-on service that provides access to several secure ESA websites and services.
When you end your CAS single sign-on session by logging out of CAS, CAS attempts to log you out of all the services that you visited during your session. While this works well under normal circumstances, there are a number of fundamental limitations with this feature. For that reason it is strongly recommended that you close your browser after logging out of CAS, particularly in cases where additional security is merited, such as a shared computer.
For security reasons, please Log Out and Exit your web browser when you are done accessing services that require authentication!