Please help 2 DCs no longer are opening AD users and computers!

I am going to ignore the moronicism of whatever the OP clown did¹ and focus on this comment I’ve screenshotted.

Yes, that makes the server vastly more secure, to disable the NIC. It’s perfect security, in fact: it becomes nearly impossible to hack or to exfiltrate data short of visiting the data center to do some dirty deeds on premises or to lug the machine out the door.

Flawless security.

1. Which I could fix in 15-20 minutes.