Weird event:

8-node web farm, not clustered, running IIS6. All identical builds (p2p application for migrations). There is one application that runs using Windows Integrated Authentication. It works well on nodes 4 and 5, but does not work on the remaining 6. The web.config file is set to allow only a certain AD group. However, the other 6 nodes do not work unless set to Basic Authentication. I likely have left some details out, so please feel free to ask anything you may need.

Thanks for any help

Edit: The app works with Basic Auth, but the Apps team won't take that as the fix since those 2 work with Integrated Auth. I would at least like to find out if those 2 working with IA are the anomaly, or if the 6 working with BA are needing something else. Can post web.config lines if you need them.