After Deploying a Web App from WAB on our own ArcGIS Servers we get intermittent portal login pages. Has anyone seen this? Our proxy authenticates fine and most times you never see the portal login page. When you do see the portal login, i can click the back button and it takes me directly to the web app without a login. Our internal portal page is causing a lot of problems by randomly requesting a login. Any help would be greatly appreciate.