The portal and other AquaLogic User Interaction products, such as Collaboration and Publisher, periodically send HTTP requests to the Image Service to check the version of the JavaScript components stored on the Image Service. These requests are not associated with a particular user's session and do not send an SSO cookie or other credentials. If the Image Service is protected by your SSO solution, the request from the portal is blocked from checking the JavaScript versions. As a result, the portal is unable to load the proper JavaScript files and end users encounter JavaScript errors and possibly other errant behavior. To resolve this problem, do not configure your SSO authentication server to protect the Image Service, but only the portal. You do not need to protect the Image Service as it contains only static public content that ships with every portal installation. No data specific to users or to your organization is ever stored on the Image Service.