> 1.      Does CAS server callback the other signed in services for
> invalidating their sessions?

Yes.

> How does that happen and how can I track it?

The server tracks that information so that you should not have to.
The server implementation: at logout time, the TGT associated with the
authenticated user is retrieved and the logOutOfServices method is
called, which iterates over the services map sending a SAML
LogoutRequest POST to each one.
https://github.com/Jasig/cas/blob/master/cas-server-core/src/main/java/org/jasig/cas/ticket/TicketGrantingTicketImpl.java
is a good starting point for source review if you need further
information.

> 2.      Does configuring the Single Sign out filter in the client is
> essential for the CAS server callback to work?

Yes.  That is the component that responds to the SAML LogoutRequest
sent by the server.

M

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