Hello,

I have a problem with the Single Sign Out feature working with session-fixation 
protection feature.

Indeed, Spring Security ConcurrentSessionControlStrategy always invalidate the 
existing session (call of session.invalidate()) and create new one to prevent 
from session-fixation attacks.

So, after CAS login process, 
SingleSignOutHttpSessionListener.sessionDestroyed() is called causing "ST to 
original session association" to be removed from SESSION_MAPPING_STORAGE.

When a single sign out request is post, the new session isn't invalidate 
because "ST to new session association" were never been registered in 
SESSION_MAPPING_STORAGE.

Versions :
Spring Security 3.0.5.RELEASE
Spring Security CAS Client 3.0.5.RELEASE
Cas Client Core 3.1.10
Cas Server 3.4.4

Thanks for reply
Fabrice DUBOIS
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