I have just installed CAS to be used in our insitution. However i'm having a
problem which I can't find how to overcome. When the user is authenticated, the
TGT cookie is added normally and user is granted access to the service. When
the service session expires, it redirects the user back to CAS to issue a new
service ticket. When the request reaches CAS, it finds the TGT Cookie exists
and tries to generate a new service ticket. However during the service ticket
creation, it finds that the TGT ticket stored in the cookie is expired (and the
record is deleted from the database) so it throws an error and the user stays
on the CAS page. The only solution everytime for the user to be able to login
is to delete the cookie manually so that CAS will generate a new TGT ticket. So
how to delete the cookie and reauthorize the user if the TGT ticket is expired?
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