How to Fix VPN Certificate Validation Failure

Virtual Private Networks (VPNs) are essential tools for maintaining privacy and security in our increasingly interconnected world. However, like any technology, they can sometimes run into issues. One such problem that users often encounter is the “VPN Certificate Validation Failure” error. This comprehensive guide will help you understand this error and provide detailed steps to fix it.

Understanding VPN Certificate Validation Failure

A VPN certificate is a digital document that authenticates a user’s connection to a VPN server. It’s a crucial component of the secure connection process, ensuring that the server you’re connecting to is indeed the one you intended to connect to. However, if your device doesn’t recognize the server’s certificate, you might encounter a VPN certificate validation failure.

This error is typically due to the server’s certificate not being trusted by the device. It could be because the certificate has expired, there’s a mismatch in the Common Names (CN), or the Certificate Authority (CA) that issued the certificate is not trusted. In some cases, a corrupted VPN installation can also cause this error.

How to Fix VPN Certificate Validation Failure

Here are some steps you can take to fix the VPN certificate validation failure error:

1. Add the VPN Server’s Certificate to the Trusted List

One of the simplest solutions is to add the VPN server’s certificate to your device’s list of trusted certificates. This process varies depending on your operating system, but it generally involves accessing your device’s security settings and manually adding the certificate.

2. Install a Third-Party VPN Client

If adding the certificate to the trusted list doesn’t work, consider installing a third-party VPN client that supports certificate validation. These clients often have more robust certificate handling capabilities and can help bypass issues with the built-in VPN client on your device.

3. Repair the VPN Installation

If the error persists, there might be an issue with your VPN installation. Try repairing the installation using the VPN client’s built-in repair tool or reinstall the client altogether.

4. Update the VPN Client

Sometimes, the error could be due to an outdated VPN client. Check if there’s an update available for your VPN client and install it if there is. This could potentially fix any bugs or issues causing the certificate validation failure.

5. Contact Your VPN Provider

If all else fails, reach out to your VPN provider for assistance. They might be able to provide specific instructions for your situation or offer additional solutions.

Additional Troubleshooting Steps

If the above solutions don’t resolve the VPN certificate validation failure, here are some more advanced troubleshooting steps you can try:

6. Check the Date and Time Settings

Incorrect date and time settings on your device can cause issues with certificate validation. Ensure your device’s date and time are set correctly. If they’re not, correct them and try connecting to the VPN again.

7. Verify the Certificate’s Common Name (CN)

The Common Name (CN) on the certificate should match the domain name of the server you’re trying to connect to. If there’s a mismatch, you’ll encounter a validation failure. You can view the certificate’s CN by inspecting the certificate details.

8. Check for Firewall Interference

Sometimes, your firewall might block the VPN connection, causing the certificate validation failure. Try temporarily disabling your firewall and see if the VPN connection works. If it does, you’ll need to configure your firewall to allow the VPN connection.

9. Update Your Device’s Operating System

Operating system updates often include security patches that can resolve VPN connection issues. If your device’s operating system is outdated, consider updating it.

10. Consult with Your Network Administrator

If you’re using a VPN for work or in a corporate setting, the issue might be on the network’s end. In this case, it’s best to consult with your network administrator. They can check the server’s certificate and possibly update or reissue it if necessary.

Remember, while these steps can help you troubleshoot the VPN certificate validation failure, it’s crucial to maintain the security of your device and network. Always ensure that any changes you make align with best security practices.


Dealing with a VPN certificate validation failure can be frustrating, but with the right knowledge and tools, it’s a problem that can be solved. By following the steps outlined in this guide, you’ll be well on your way to restoring your secure VPN connection.

Remember, maintaining a secure online presence is crucial in today’s digital age. A VPN is a valuable tool in achieving this, and understanding how to troubleshoot common issues like a certificate validation failure is an essential skill.

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