> When you say that you put a reverse proxy in front of Tomcat... do you mean 
> that you pushed the authentication out to the proxy layer?

Yes, I'm delegating everything to HTTPD using an AJP connector.

> This means that if the user changes their password or the group-membership 
> changes on the LDAP side, httpd won't know about those changes and therefore 
> old credentials are still valid, old group-based authentication checks will 
> yield invalid authentication decisions based upon the canonical LDAP 
> service's view of the world.

So does session caching! Actually HTTPD have a better control because it allows 
you to choose the appropriate TTL instead of assuming the same credentials for 
the whole session.

Frédéric.

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