I am running an AD Forest and when I don't have Internet connection on the entire network, some computers cannot log in on the domain

Hello!
I run an AD Forest and when my Internet connection is not working, some of my PCs cannot sign in on the domain, while the majority can do this without any problems.
Could you please help,
Thanks,
Radu

Hi,
Usually, we have an edge device for internet connection and LAN connection, like a router. So I suppose gateway is not working properly.
For further troubleshooting, please provide your network topology. DNS, gateway settings. Test if you can ping DC when the issue occur.

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