ios - How to exempt requests without AD authentication in IIS server -

we developed client server application. client application developed using objectve c , server application developed using .net. earlier had separate user base in our application db application authorization. in ios application user authorization done through back-end server.

recently want change authorization mechanism use active directory. able integrate ad in our back-end server without problem.

but had great deal of problem our ios application. when user launch ios app following 2 things before showing login screen user. 1. check whether sever accessible 2. download initial settings after integrating ad back-end both above requests failed http 401 (unauthorized) error. need exempt 2 requests ad authentication. can 1 please resolve issue?

following image shows our configuration in iis server.