Did you apply a Windows Firewall Policy that blocks the ability to talk to Active Directory and get Group Policies? We all make mistakes….
You can no longer login to this box with Active Directory Credentials…..
You try to login as a local administrator and see that everything is grayed out?
On top of that you also turned off the ability to apply local firewall rules?
Don’t fear! There is a way to fix this as long as you have Local Admin rights on the box. Open up the Registry Editor and navigate to:
Right-Click the WindowsFirewall key and delete it and all sub-keys and reboot.
This should fix the issue and you will pull down the corrected Group Policy on reboot.