> it's a security issue for us since a user could log in as the previous
> user.

Only if they're using the same browser since both CAS application
state and application session state is based on cookies.  Is this a
kiosk environment?  The best practice has been and continues to be
closing the browser when finished with an SSO session.  I realize that
modern browsers that keep components memory-resident takes away from
this recommendation, but it's the best we have.

> I don't think it's a network issue, since both apps and CAS are all on
> the same host, so I think it could be a configuration problem of some sort.

I would recommend you turn up the logging on both the CAS server and
troublesome application to ensure that CAS is sending the
LogoutRequest and that it is being received by the application.  There
is a very prominent message (WARN) I believe if the CAS server has
connection problems sending the message.  It will also be logged on
the client if you're using the Jasig Java CAS client.  I believe other
CAS clients log it as well.

M

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