Setup an existing CF website on IIS (previously on Apache) Application is working fine However there is some issue with the cookie management, Coldfusion (2016) is not able to read the cookie and its value passed with the Request Headers and it shows a separate set of cookies when dumped Any clue where the issue be (IIS setup or Coldfusion configuration)?

CF 2016 has reached it's official end of life. Better to migrate the application to CF 2018 or CF 2021. That being said, check the domain of the cookie that is being set in the browser, check if session management and setclientcookies are enabled or not, if using J2EE session management check sessioncookie same site settings.