IIS cofiguration- Request Filtering

Hi All,

We are implementing Business central On-Prem version for one of our customers and they have enables lots of security features enabled due to data privacy.

So at IIS level, client has added exceptions that we need to mention all the file extensions which Business central Web Server instance is using and made the “Allow unlisted File nam Extensions” boolean unchecked as highlighted in screenshot. With this modification, Export to excel feature & all reports has stopped working. If I enable this box, everything will work fine.

Looking forward to any suggestion, what would be the extension I need to mention so that export to Excel & RLDC reports can work. I have added .xlsx, .xls, .rdlc,.rdl as file extensions(highlighted in screenshot) but nothing works.