A Step-by-Step Guide to Troubleshooting DNS Issues in an Active Directory Domain Controller

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command used :

ipconfig /flushdns
netsh winsock reset

When dealing with DNS issues in an Active Directory domain controller, it is important to follow a systematic approach to ensure that the issue is identified and resolved in a timely and efficient manner. Here's a step-by-step guide to help you troubleshoot DNS issues in an Active Directory domain controller:

1.Check the DNS server settings: Start by verifying that the DNS server settings on the domain controller are configured correctly. Check that the DNS server IP address is correctly entered in the network adapter properties, and that it matches the IP address of the domain controller. Also, ensure that the DNS server is listening on the correct network interface.

2.Check the DNS service: Check that the DNS service is running on the domain controller. To do this, open the Services console and verify that the DNS Server service is started and set to Automatic.

3.Check the DNS zone: Verify that the DNS zone is configured correctly on the domain controller. Check that the zone is Active Directory integrated, and that it is set to replicate to all domain controllers in the forest. Also, verify that the zone contains the correct DNS records.

4.Check DNS name resolution: Use the nslookup command to verify that DNS name resolution is working correctly on the domain controller. Run nslookup and enter the name of the domain controller. The command should return the IP address of the domain controller.

5.Check the DNS cache: Clear the DNS cache on the domain controller. Open a command prompt and enter the following command: ipconfig /flushdns. This will clear the DNS cache on the domain controller and force it to query the DNS server for the latest information.

6.Check the firewall settings: Verify that the firewall settings on the domain controller are configured correctly to allow DNS traffic. Ensure that port 53 is open for both TCP and UDP traffic.

7.Check the event logs: Review the event logs on the domain controller for any DNS-related errors or warnings. These logs may provide additional information that can help identify and resolve the issue.

By following these steps, you should be able to troubleshoot most DNS issues in an Active Directory domain controller. However, if the issue persists, you may need to seek assistance from a network administrator or a Microsoft support professional.

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