App Platform not asking for login

We have setup AppPlatform on verion 10.3 and have deployed a Servlet Web App on it. We can confirm that web app is able to get web security using Integration Server ACLs. However upon opening the landing page it is not asking for User Login Prompt as Integration server. Due to this we are not able to make security work.

Please let us know a possible reason for same.

Courtesy to Software AG support, Issue resolved by using below config in web.xml.

Public /* Administrators BASIC App Platform