I'm using Intergrated Windows Authentication to allow my end-users access to a web app in ArcGIS Enterprise Portal.
In IIS I have a virtual directory of images that link to features in the Portal web app. To access images on this virtual directory, users are required to login using Windows Authentication.
How do I combine these login requirements so the user only has to login once to access both the Portal Web App and the related images found in the IIS virtual directory?