Groups and roles issues

Hello,

We use two user accounts, one that is a server administrator and that we use to connect to the servers via RDP (ADMaccounts).

The other is not an administrator and we use it on our workstations (USRaccounts).

I deleted from Gateway Users the Builtin\users group because I don't want users to access even though they can't do anything. For now I added another group as Gateway Users with our  USR accounts. ADM accounts are member of Gateway Administrators.

When Im logged into WAC with the ADM user and access to WAC, the browser asks me for credentials, I enter the ADM credentials, and I log in.

When I am at my workstation, I access the URL and log in without being asked for credentials with the USR account session.

I do not understand this behavior. I need to access from my workstation with the ADM account.

How can I make the browser ask me for credentials?

Do I have to open the browser with the admin credentials every time I want to manage WAC?

Thanks,

Best regards