How to Fix DHCP Server Authorization Failed Error Code 20079

Key Notes

  • Ensure AD DS is properly functioning to authorize DHCP.
  • Restarting the DHCP and AD DS services can resolve many issues.
  • If problems persist, consider removing and reinstalling the DHCP server.

Troubleshooting DHCP Server Authorization Errors in Windows Server

Encountering an authorization failure for the DHCP server with Error Code 20079 can disrupt network services significantly. This guide outlines practical solutions to address this issue across various versions of Windows Server.

Steps to Fix Authorization Failure with Error Code 20079

To resolve the authorization failure of your DHCP server with Error Code 20079, follow these comprehensive steps:

Step 1: Restart the DHCP Server Service

Begin by restarting the DHCP Server service to ensure it’s functioning properly. Here’s how:

  • Type services in the Taskbar search box.
  • Open the corresponding search result.
  • Double-click on the DHCP Server service entry.
  • Hit the Stop button.
  • Set the Startup type to Automatic.
  • Click the Start button.
  • Once completed, click the OK button.

Pro Tip: Regularly check the status of your services to prevent future interruptions.

Step 2: Restart the Active Directory Domain Services

It’s crucial to also restart the Active Directory Domain Services (AD DS).Here’s how to do it:

  • Open the Services wizard on your computer.
  • Double-click on the Active Directory Domain Services entry.
  • Click the Stop button.
  • Then select the Start button.
  • Wait for the process to complete.
  • Finally, click the OK button.

Pro Tip: Keeping your AD DS running smoothly is essential for network health.

Step 3: Remove the Existing Server Registration

If your DHCP server is still listed in AD DS, manually removing it can be necessary. To do this:

  • Launch Server Manager.
  • Select Tools > Active Directory Sites and Services.
  • Right-click on Active Directory Sites and Services, then choose View > Show Services Node.
  • Expand the Services section and select NetServices.
  • Find the server you want to delete, right-click it, then select Delete.

Pro Tip: After removal, rerun the DHCP Server setup wizard to reconfigure.

Step 4: Reinstall the DHCP Server

If previous solutions haven’t worked, uninstalling and reinstalling the DHCP Server may be necessary. Follow these steps to uninstall:

  • Open Server Manager on your computer.
  • Select Manage > Remove Roles and Features.
  • Proceed with the wizard and uncheck the DHCP Server option.
  • Click on Remove Features and continue by selecting Next.
  • Click Remove once the process is completed, then click Close.

Pro Tip: Always back up configurations before performing a full reinstall.

Summary

This guide has provided practical steps to troubleshoot and resolve the authorization failure of the DHCP server with Error Code 20079 in Windows Server. By following these steps, you can restore the functionality of your DHCP services efficiently.

Conclusion

Resolving the DHCP authorization failure is crucial for maintaining network service integrity. Remember to keep your Active Directory services updated and monitor your DHCP server settings regularly to prevent similar issues in the future.

Frequently Asked Questions

How can I authorize the DHCP server that failed with error code 20079?

To authorize the DHCP server, remove any existing server entries from Active Directory Sites and Services first. Then, run the DHCP server setup again to allow automatic authorization.

What does error code 20070 indicate regarding DHCP authorization?

Error code 20070 typically indicates that the Active Directory Domain Services are not allowing the DHCP server setup due to insufficient user permissions.