> My problem is that when the http session of service app B times out the CAS 
> hosted login prompt is
being rendered in the iframe.

That would happen for one of two reasons:

 1. CAS SSO session has expired
 2. Browser is not sending CASTGC cookie containing TGT to CAS server

> When the session times out for B the CAS TGT is still valid.

That seems to rule out #1, so I'd concentrate on #2.  There are tools
to dump the servlet request to a log file [1], which would help
confirm or refute the cookie hypothesis.

M

[1] 
http://code.google.com/p/vt-middleware/wiki/vtservletfilters#RequestDumperFilter

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