We have 2 WFE's and a Citrix NetScaler load balancer (LB). We have issues where the load balancer 'randomly' requests user to authenticate. We know this because the load balancer URL is shown in the authentication box. We have ensured that our web applications are trusted and that the logged on user's credentials are always used for web application access, however are not sure why the LB would be asking users to authenticate. Often if the user just closes down the box they can continue working but usually content linked to mysites is missing (user profiles images for instance - a red cross where the image should be)We are sure it happens for other cases but we cannot clearly qualify all other cases. If users enter their credentials and click to save username and password, we get mixed results and they often cannot get back to the intranet SP2013 site unless they clear out their Windows credentials.
Does anyone in the SP2013 world have experience with this issue?