Setting a loopback policy setting for Domain Controllers/Preventing IE from accessing externally

Hello, we need to set a lookback policy for our domain controllers to ensure IE doesn't access externally. Is the loopback the best method, or do you all have recommendations?

As far as I'm aware, there's not a good Group Policy setting to do this. 
If I understand your question correctly, you wish to prevent external Internet browsing from your Domain Controllers, but everyone else (other servers and workstations) should have full access.
If that's the case, I would recommend blocking port 80 for the Domain Controllers in your Firewall, as they (I hope) have static local IP addresses.
If you know of a good Group Policy setting however, it would be best to set it in the Default Domain Controller Policy, as that will only affect the Domain Controllers.
The "loopback" policy you're referring to is the "Configure user Group Policy loopback processing mode", which can be used to apply the computer configuration "instead of" or "merged with" the user configuration when
a user logs on to computers where this policy applies. Since the computer configuration is normally applied before the user configuration, that can be used to force rules on computers regardless of who's logging in.
Please mark as answer or vote
as helpful when
it applies. Thanks!

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