Hi Nishit,
Welcome to the
Exchange 2013 - Administration, Monitoring and Performance forum. This forum is for questions and feedback related to
Exchange Server 2013. Since your question is more related to the authentication about
IIS, I recommend to post your question in below forum:
https://forums.iis.net/
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us.
Thank you for your understanding.
Best Regards,
Allen Wang
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