Troubleshooting ‘The Remote Computer Requires NLA’ Error: A Comprehensive Guide

Introduction

Encountering the ‘The Remote Computer Requires NLA’ error when trying to establish a Remote Desktop connection can be frustrating. This common issue mainly stems from the settings related to Network Level Authentication (NLA), a feature that enhances security for connections to remote systems. Understanding and resolving this error is crucial for uninterrupted and secure remote access. Let’s dive into this comprehensive guide to diagnose, fix, and prevent NLA errors effectively.

Understanding Network Level Authentication (NLA)

To address the ‘Remote Computer Requires NLA’ error, it’s essential to understand Network Level Authentication (NLA). NLA is a security feature introduced to add an extra layer of protection to the Remote Desktop Protocol (RDP). It ensures that the user is authenticated before establishing a remote session, making it less vulnerable to attacks. With NLA enabled, users need to provide credentials in advance, preventing unauthorized access and resource exhaustion on the remote server.

By shedding light on NLA’s functionalities, we can better appreciate its role in securing remote desktop connections, which is vital for both IT professionals and end-users.

Common Causes of the NLA Requirement Error

Now that we understand NLA, let’s explore the common causes of the ‘Remote Computer Requires NLA’ error. Identifying the root cause is the first step in resolving the issue effectively.

1. Disabled NLA on the Remote Server: If NLA is not enabled on the remote desktop server, you cannot connect securely.
2. Incorrect RDP Client Settings: The Remote Desktop client may not be configured correctly to support NLA.
3. Outdated Windows or RDP Client: Ensuring both the operating system and the RDP client are up-to-date can help avoid compatibility issues.
4. Network Issues: Sometimes, connectivity problems between the client and the server can trigger the error.
5. Group Policy Settings: Misconfigured group policies may prevent proper NLA functionality.

Understanding these common causes enables us to take targeted steps to resolve the problem swiftly.

How to Check and Configure NLA Settings on Remote Desktop Server

To fix the NLA error, we need to verify and configure the settings on the remote desktop server. Follow these steps to ensure NLA is properly configured:

1. Access the Remote Server:
2. Log in to the remote desktop server with admin credentials.
3. Open Server Manager:
4. Click on ‘Start’ and select ‘Server Manager’.
5. Navigate to Remote Desktop Settings:
6. In the ‘Server Manager’ window, click on ‘Local Server’ on the left-hand pane.
7. Modify Remote Desktop Settings:
8. In the ‘Properties’ section, locate ‘Remote Desktop’. Click on the ‘Disabled’ link if Remote Desktop is not already enabled.
9. Enable NLA:
10. In the ‘Remote’ tab, you will find the section ‘Secure Connections’ with the option ‘Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended)’. Ensure this box is checked.
11. Apply and Save Settings:
12. Click ‘Apply’ and then ‘OK’ to save changes.

After configuring the NLA settings on the remote server, the error should be resolved, making remote connections secure and efficient.

Verifying and Updating RDP Client Settings

While server-side configuration is crucial, it’s equally important to ensure the RDP client settings are accurate and updated. Follow these steps to verify and update your RDP client settings:

1. Update RDP Client:
2. Ensure your Remote Desktop Client is up-to-date. Visit the official Microsoft website to download the latest version if needed.
3. Open Remote Desktop Client:
4. On your local machine, open the ‘Remote Desktop Connection’ application.
5. Access Advanced Settings:
6. Click on the ‘Show Options’ button at the bottom left corner of the RDP client window.
7. Review General Tab:
8. Enter the remote computer’s name or IP address and your credentials.
9. Check Advanced Tab:
10. Navigate to the ‘Advanced’ tab, and under ‘Server Authentication’, ensure the ‘Always connect, even if authentication fails’ option is not selected.
11. Save Configuration:
12. Click on the ‘Save As’ button in the ‘General’ tab to save the settings for future use.

These steps help in ensuring the client-side settings are optimal and support NLA, reducing the chances of encountering the error again.

Advanced Troubleshooting Methods for NLA

If you still encounter the error despite configuring the server and client settings, advanced troubleshooting may be necessary. Here are some methods to consider:

1. Group Policy Configuration:
2. Use the ‘Group Policy Editor’ on the remote desktop server to navigate to Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Security. Ensure ‘Require user authentication for remote connections by using Network Level Authentication’ is enabled.
3. Check Event Logs:
4. Inspect the Event Viewer logs on both the client and server side for any signs of issues related to RDP and NLA.
5. Firewall Configuration:
6. Ensure that the firewall is configured to allow RDP connections on both the client and server sides.

These advanced methods should address persistent issues and ensure a smoother connection experience.

Best Practices for Preventing NLA Errors

Preventing NLA errors from occurring in the first place is always better than resolving them. Adhere to these best practices:

1. Regularly Update Software:
2. Keep both server and client systems updated with the latest security patches and software updates.
3. Strong Authentication Methods:
4. Use strong credentials and enable multi-factor authentication (MFA) for remote access.
5. Network Security:
6. Secure your network with VPNs and firewalls to add an extra layer of protection against unauthorized access.

Implementing these practices can significantly reduce the likelihood of encountering NLA errors.

Conclusion

Troubleshooting the ‘Remote Computer Requires NLA’ error can be straightforward if you understand the underlying settings and configurations. This comprehensive guide has covered everything from understanding NLA to advanced troubleshooting methods and best practices for prevention. By following these steps, you can ensure a secure and seamless remote desktop experience.

Frequently Asked Questions

Why do I keep getting the ‘Remote Computer Requires NLA’ error?

This error often occurs due to misconfigured NLA settings on the remote server, outdated RDP clients, or network connectivity issues. Ensure both server and client settings support NLA and are regularly updated.

How do I enable NLA on my remote desktop server?

To enable NLA, log into the remote server, open Server Manager, navigate to the Remote Desktop settings, and check the box for ‘Allow connections only from computers running Remote Desktop with Network Level Authentication’.

What are the security benefits of using NLA?

NLA provides an added layer of security by requiring user authentication before establishing a remote session. This prevents unauthorized access and mitigates the risk of denial-of-service attacks on the remote server.