environment gallery, ISA Server 2005 R2, WebSite hosted on Apache using http, publish through ISA with https.
problem login/logout issue. User logs in. Clicks the gallery logo in the top left. Gets the guest front page. If the user visits a sub page it works again... and for some not...
solution Turn of reverse proxy caching in ISA. Configuration/Cache/Cache Rules. Create a new rule including the server that hosts the web site. Check "Never cache the response" and disable http caching.