A blank page opens up whenever a user tries to authenticate to specific link within the instance other than the homepage. The expectation is to see a login prompt.Issue Users are NOT prompted to authenticate, when they try to open a link within the instance, other than link to the homepage.SymptomsIf a user goes to a link within the instance such as this: https://<instance>>servicenowservices.com/now/nav/ui/classic/params/target/catalog_home.do, they receiving a blank screen, instead of screen with a login prompt. However, if they go the homepage link, for example: https://<instance>.servicenowservices.com, they are prompted to login and do not get a blank screen. The logs will also show access denied errors to the processor, such as this: ".....event="PPROCESS_ACCESS_DENIED" target_processor="UxAppProcessor" interactive="true"...."ReleaseAllCauseThis is typically caused by a modification to the Access Control (UxAppProcessor), Type=processor, Operation=execute, where the Requires role has been changed to something other public. The role must be public in order for re-direction to occur, and the user that is attempting to access a link within the instance to receive a login prompt. ResolutionBe sure the Required roles on this processor ACL is set to public.