Sometime last night our web adapter server started not being able to communicate with our arcgis server map services, unless the user supplied a user name and password.
All of our map services are open to the public and have been working great for years. Now if you try to get to any of them via the rest endpoint url, you are greeted with a ArcGIS Server REST API login screen. I can login with my site admin creds but that doesn't ultimately solve the problem as I have a ton of web apps that access those map services without any security... so they are dead in the water.
Anyone know what is going on or how to fix this? I uninstalled then reinstalled the web adapter software and configured it properly with no success.