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Here's how to Fix An Active Directory Domain Controller (AD DC) for the domain could not be contacted on Windows.

If you're encountering the "An Active Directory Domain Controller (AD DC) for the domain could not be contacted" error on Windows, there are a few things you can try to resolve it:

1. Check network connectivity: Ensure that the computer is connected to the network and can communicate with the domain controller. Check the network cables, switches, and routers to make sure they are properly configured and working.

2. Check DNS settings: Ensure that the DNS settings on the computer are pointing to the correct DNS server(s) that are authoritative for the domain. If necessary, update the DNS settings in the network adapter properties.

3. Check time synchronization: Ensure that the time on the computer is synchronized with the domain controller. Time differences between the computer and the domain controller can cause authentication failures.

4. Check domain controller availability: Ensure that the domain controller is running and accessible from the computer. You can try to ping the domain controller or connect to it using the Remote Desktop Protocol (RDP) to verify its availability.

5. Check firewall settings: Ensure that the Windows Firewall or any third-party firewall software is not blocking communication between the computer and the domain controller. You may need to configure firewall rules to allow the necessary traffic.

6. Check domain membership: Ensure that the computer is a member of the domain and that its domain account is not locked or disabled. You may need to reset the computer account in the domain or rejoin the computer to the domain.

If none of these steps resolve the issue, you may need to troubleshoot further or seek assistance from a system administrator or technical support professional.