How do I troubleshoot Active Directory connectivity issues?

1. Verify that the Active Directory domain controllers are reachable from the client.
2. Check the authentication settings to ensure user credentials are valid and consistent with the organization’s requirements.
3. Test connecting to the domain controller using a valid username and password to ensure that everything is working correctly.
4. Check network settings to verify that the client is in the same subnet as the domain controller.
5. Check the firewalls to ensure that the proper ports are opened to allow connection between the client and the domain controller.
6. Verify that the client is able to access the appropriate DNS server.
7. Ensure that Active Directory services are running on the domain controller.