Software⏱️ 3 min read📅 2026-06-19

How to Fix: Windows 2012 Domain Controller NETLOGON error

Windows 2012 Domain Controller NETLOGON error caused by DNS registration failure, resolve by running DCDiag.exe and checking firewall settings.

Quick Answer: Check Sonicwall firewall user authentication System logs for errors, run DCDiag.exe to diagnose DNS registration issues and ensure DNS records are correctly registered.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The Windows 2012 Domain Controller is experiencing a NETLOGON error, which is preventing users from authenticating successfully. This issue affects all users who have been authenticated through the Sonicwall firewall, resulting in them being logged out. The Event Log on the Active Directory server indicates that the dynamic registration of the DNS record 'ForestDnsZones.comp.com' failed, with a returned response code of 5 and status code 9017.

This error is frustrating for users who rely on the domain controller for authentication, and it requires immediate attention to resolve. The goal of this troubleshooting guide is to identify the root cause of the issue and provide steps to fix it.

🔍 Why This Happens

  • The primary reason for this error is that the DNS record registration failed due to an incorrect or missing DNS server IP address. This can occur when the Sonicwall firewall configuration is not properly set up or when there are issues with the domain controller's DNS settings.
  • An alternative cause could be a conflict between the PowerShell script used to create user accounts and the Active Directory schema, which may have led to an incorrect password hash being stored in the AD database.

✅ Best Solutions to Fix It

Method 1: Verify and correct Sonicwall firewall configuration

  1. Step 1: Step 1: Check the Sonicwall firewall configuration to ensure that it is correctly set up for user authentication. Verify that the DNS server IP address is entered correctly and that the domain controller's FQDN is properly configured.
  2. Step 2: Step 2: Restart the Sonicwall firewall service to apply any changes made in Step 1.
  3. Step 3: Step 3: Test the authentication process again using a test account to verify that the issue has been resolved.

Method 2: Resolve DNS record registration issues

  1. Step 1: Step 1: Run DCDiag.exe on the domain controller to identify any potential issues with DNS record registration. This will help determine if there are any errors or conflicts that need to be addressed.
  2. Step 2: Step 2: Check the Active Directory database for any incorrect password hashes and correct them using the 'Set-ADUser' cmdlet. Ensure that the correct password hash is stored in the AD database.

💡 Conclusion

To resolve the NETLOGON error on the Windows 2012 Domain Controller, it is essential to first verify and correct the Sonicwall firewall configuration and DNS record registration settings. If these steps do not resolve the issue, then further investigation into the Active Directory schema may be necessary to identify and correct any conflicts or errors that are causing the problem.

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