eXo Platform 4.0 Documentation > Reference Guide / GateIn > Authentication and Identity > Single-Sign-On (SSO) > Central Authentication Service (CAS)

4.8.1.4. CAS SSO cookie configuration

CAS server is using a special cookie CASTGC, which is useful for SSO scenarios with more Service applications. For example, you have a single CAS server and two eXo Platform servers configured to use it (in which eXo Platform instances are marked as accounts and services). So if your login is against CAS server with accounts of eXo Platform instance, you do not need to authenticate again when you access CAS with services of eXo Platform instance. You will be auto-authenticated when clicking Sign in on the services instance. This is real SSO and works thanks to CASTGC cookie, which automatically creates a new ticket for services instance if it recognizes that user is already authenticated.

However, the CASTGC cookie is secured by default (available only from https connections). So to make it work, you have 2 possibilities:

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