How to fix VPN authentication failed error message


Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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vpn authentication failed

Using a VPN is one of the best ways to protect your privacy online, however, many users encountered VPN authentication failed message. This can be a big problem and prevent you from using your VPN, but there’s a way to fix it.

VPN errors can be problematic and speaking of VPN errors, here are some common issues that users reported:

  • Cisco Anyconnect VPN authentication failed – Sometimes this problem can occur due to your antivirus or firewall, and in order to fix it, be sure to temporarily disable both your antivirus and firewall and check if that helps.
  • Express VPN, Nordvpn, Cisco Anyconnect VPN, Asus OpenVPN authentication failed – This issue can affect almost any VPN client, but you should be able to fix the problem using one of our solutions.
  • VPN user authentication failed Tunnelbear – Sometimes a corrupt installation can cause this problem to occur. To fix the issue, it’s advised that you reinstall your VPN and check if that helps.

VPN authentication failed, how to fix it?


  1. Check your antivirus and firewall
  2. Disable your firewall
  3. Check your login credentials
  4. Make sure that you’re not exceeding the number of connections
  5. Make sure that your service is paid for
  6. Change your username and password
  7. Reinstall your VPN client
  8. Perform a Clean boot
  9. Try switching to a different VPN client

Solution 1 – Check your antivirus and firewall

bitdefender vpn authentication error

If you’re getting VPN authentication failed message while trying to use your VPN client, perhaps the problem is your antivirus or firewall. Your antivirus can sometimes block the VPN client from working, and that can cause this and many other problems to occur.

To fix the problem, it’s advised that you check your antivirus settings and make sure that your VPN isn’t blocked by your antivirus. To ensure that, add the VPN to the exclusions list in your antivirus. In addition, you can try disabling certain antivirus features or disable your antivirus altogether.

If that doesn’t solve the problem, perhaps you can try uninstalling your antivirus. If you’re on Windows 10, you’ll be protected by Windows Defender even if you remove your third-party antivirus, so there’s no need to worry about your safety.

Once you remove your antivirus, check if the problem is still there. If the issue doesn’t appear anymore, it means that your antivirus was interfering with it. If you’re looking for a good antivirus that won’t interfere with your VPN client, perhaps you should consider using Bitdefender. The new, 2019 version, has compatibility improvements so it will not create any issues.

    –  Download Bitdefender Antivirus 2019


Solution 2 – Disable your firewall

According to users, sometimes VPN authentication failed message can appear if your firewall is blocking the VPN client. To fix this problem, users are suggesting to temporarily disable your firewall and check if that solves your problem.

To disable your third-party firewall, you’ll have to open its settings page and find the disable option. However, Windows also has its own firewall, and you might need to disable it as well in order to troubleshoot this issue.

To do that, follow these steps:

  1. Press Windows Key + S and enter firewall. Select Windows Firewall from the list of results.
    vpn authentication error firewall search
  2. Once the Windows Firewall window opens, choose Turn Windows Firewall on or off from the left pane.
    vpn authentication error turn firewall on or off
  3. Select Turn off Windows Firewall (not recommended) for both Public network and Private network profiles. Now click the OK button to save changes.
    vpn authentication failed disable firewall

After doing that, your firewall will be completely disabled. Bear in mind that disabling the firewall isn’t advised since it can leave your PC at risk. However, if disabling the firewall fixes the problem with the VPN, the issue is most likely related to your firewall settings, so you’ll need to adjust them accordingly.


Solution 3 – Check your login credentials

If your firewall or VPN isn’t the problem, perhaps you should check your login credentials. It’s possible that you mistyped your username or password, and that might be causing your problem. To fix the issue, be sure to double check your login information and make sure that it’s completely correct.

Be sure to check for uppercase and lowercase letters since they can be the common problem for login issues.


Solution 4 – Make sure that you’re not exceeding the number of connections

Many VPN clients allow you to have a limited number of VPN connections at a time, and if you exceed the number of these connections, you might get VPN authentication failed message. To fix the problem, be sure to check all the devices that are using your VPN.

If you have multiple PCs and phones using the same VPN service, try disabling the VPN on certain devices and check if that solves your problem.


Solution 5 – Make sure that your service is paid for

If you’re unable to use your VPN due to the VPN authentication failed error message, it’s possible that the problem is caused by unpaid service. Sometimes it can happen that you forget to pay for your VPN service, and that can lead to this and many other problems. If this issue occurs, log in to your VPN account and make sure that your VPN service is paid for.

If everything is in order in terms of payment, you can proceed to the next solution.


Solution 6 – Change your username and password

If you’re having issues connecting to your VPN client due to VPN authentication failed message, the problem might be your login credentials. If you’re certain that your login credentials are correct, perhaps you can try changing your username and password.

It’s possible that there’s a glitch with your VPN client, but you might be able to fix it by changing your username and password.


Solution 7 – Reinstall your VPN client

According to users, sometimes you can encounter VPN authentication failed message simply because your VPN installation is corrupted. This can occur for various reasons, but if you want to fix the problem, it’s advised to reinstall your VPN client.

This is fairly simple to do, and the best way to do it is to use uninstaller software such as Revo Uninstaller. By using the uninstaller software you’ll completely remove all files and registry entries related to the application you’re trying to remove. This will ensure that there aren’t any leftover files or registry entries that can interfere with future installations.

Once you remove your VPN client completely, install it again and check if the problem is still there.


Solution 8 – Perform a Clean boot

Sometimes issues with your VPN can occur due to other applications on your PC. Your PC starts with various applications, and sometimes those applications can interfere with your system or with your VPN. To fix the problem, it’s advised that you perform a Clean boot and disable all startup applications and services. This is actually quite simple to do, and you can do it by following these steps:

  1. Press Windows Key + R to open the Run dialog. Enter msconfig and click OK or press Enter.
    msconfig run dialog vpn authentication error
  2. The System Configuration window will appear. Navigate to the Services tab and check Hide all Microsoft services Now click the Disable all button to disable all these services.
    disable services vpn authentication error
  3. Head over to the Startup tab and click Open Task Manager.
  4. Task Manager will now start and show you the list of startup applications. Right-click the first application on the list and choose Disable from the menu. Repeat this step for all startup applications on the list.
    disable applications vpn authentication error
  5. Once you disable all startup applications, go back to the System Configuration Now you just have to click Apply and OK to save changes and restart your PC.

Once your PC restarts check if the problem is still there. If the issue doesn’t reappear, it’s possible that one of the startup applications or services was causing it. To find the cause, you need to enable all disabled applications and services one by one until you manage to recreate the issue.

Bear in mind that you’ll need to restart your PC or at least log out and log back in to apply the changes. Once you find the problematic application or a service, disable it or remove it from your PC.


Solution 9 – Try switching to a different VPN client

cyberghost vpn authentication failed

If other solutions couldn’t fix the VPN authentication failed error message, perhaps the problem is related to your VPN client. If that’s so, it’s advised to switch to a different VPN client and check if that solves your problem.

There are many great VPN clients on the market, but if you want a reliable VPN to protect your online privacy, you should definitely try out CyberGhost VPN.

Why choose CyberGhost?
cyberghost vpn for windows logo
  • 256-bit AES encryption
  • Over 5600 servers worldwide
  • Great price plans
  • Excellent support

VPN authentication failed error can be quite problematic, but we hope that you managed to solve it by using some of our solutions.

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