Non-networked computers/accounts need access to surf internet

We have the Sophos Complete Security Suite. 

I've noticed when I bring up a new computer, prior to it getting on to our network, that in order to surf the web (download updates, install programs) I have to enter in an Active Directory user/password. 

I've just started deploying via MDT/WDS and when those auto-deployed scripts run, the windows/installation updates don't run because the newly created machine isn't part of the network.

Where can I turn that feature off or customize that feature in Sophos (I assume it's part of the web appliance)?

Thanks!