Non privileged user can not login on presentation node

Steps to reproduce:
1.) create an unprivileged user which is able to manage series,
events and so on on the admin node.

2. ) try to login with this account using
https://<presentation-node>/admin-ng/login.html, the user is
redirected to https://<presentation-node>/index.html. The login
failed and you get an HTTP 403 error (access is denied).

3. ) try to login with this account using the possibility given under https://<presentation-node>/engage/index.html. The login is successful.

Actual Results:

Expected Results:
The unprivileged user should also be able to use case 2) to login in an presentation node (like the admin user)

Workaround (if any):
Use case 3)