Having a good VPN connection is a must for today’s tech savvy internet user. That’s why it’s very frustrating when you find yourself getting the dreaded error code 789 L2TP Connection Attempt Failed. The error message is fairly technical, so you may find yourself pulling your hair out trying to figure out how to fix it. Luckily, we’re here to help. In this article, you’ll learn a few different ways to troubleshoot and fix this pesky problem.

VPN connection on Windows 10, just like on any other platform, has its ups and downs. When your VPN connection suddenly starts to act up, one of the first things you should do is check if you haven’t done anything to obstruct the connection, like forgetting to authorize the connection or changing any of the settings without knowing the consequences. If you are sure you haven’t done anything wrong, the problem might be caused by a problem with the connection itself.

This was actually designed to be a two-part post, identifying the problem and providing the solution to it. The problem is that the 789 error message appears whenever you try to connect to your VPN. If you have a VPN connection on your Windows 10 machine, you might have seen this message popping up. The message is not very detailed but provides you with the error code 789. The message can be a little bit confusing but, luckily, it is not a difficult issue to fix.

RECOMMENDED: Download this tool to safely fix common Windows errors and automatically optimize system performance. PC users sign up and install the VPN service on their Windows 10 computers to maximize privacy and security when connecting to the Internet. There are many other reasons to use such a tool. With VPNs, however, things are not going so well. No matter which operating system you use, you are vulnerable to network errors. Today we’re going to talk about the VPN 789 bug in Windows 10. This error is one of the most common VPN issues that Windows users encounter on a regular basis. When you connect to a server using the L2TP protocol, the connection is interrupted by error 789 and then by error 791. The client you are using may not be configured to connect to an L2TP VPN server. The error message is as follows: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer. Possible causes of this error include: an invalid certificate or pre-shared key, the VPN client is behind a NAT, there is no machine certificate or server authentication as EKU, possible third-party firewall problems, network driver errors, and problems such as a missing encapsulation registry key and a disabled IPsec Keying Modules & Policy Agent.

How do I fix VPN error 789 when trying to make an L2TP connection in Windows 10

Here are some troubleshooting tips you can try to resolve VPN error 789 in Windows 10.

Method 1 – Verify correct certificate and pre-shared key

The first thing you need to do is verify that the certificate or pre-shared key is correct. The client and the VPN server must have the same certificate and pre-shared key configured.

Method #2 – Re-enabling the IPsec service

  • Open the Run dialog box, type services.msc, and press Enter.
  • Now look for the IKE and AuthIP services IPSec Keying Modules and IPSec Policy Agent.
  • Restart the service if the report shows as running. If not, you must enable it to start the service.
  • Then, immediately after double-clicking each service, select Startup Type and change the value to Automatic.
  • Now click OK to save your changes.

SO YOU SEE: Verify and correct an IP address leak on a VPN You can then restart the VPN service and try to restart the connection. Check for an error.

Method 3 – Reset the network adapter

Another method is to reset the network card settings on a Windows 10 computer. For this:

  • Open the Device Manager from the Start menu.
  • Find your network adapter.
  • Now right-click on it and then click Delete.
  • Click OK and restart the computer.

Windows 10 automatically re-installs the network adapter driver on restart and resets it to the default settings.

Method 4 – Create the UDP registry key Encapsulation with the registry editor

This method of troubleshooting requires working with the registry editor. Be extremely careful when working with this tool, because it can destroy your system irrevocably. This will help resolve the issue if you are dealing with an L2TP VPN client or server that is behind a network address translation or NAT.

  • Open the registry editor on your computer by typing regedit in the Run dialog box.
  • Click Yes to grant administrative rights when prompted by the UAC.
  • Now go to the following location in the registry editor:
    • HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesPolicyAgent
  • You must create a new value in this section.
  • Right-click anywhere on the page and select New.
  • Select the Dword value (32 bits) from the given options.
  • Now create a name for the new Dword value:
    • AssumeUDPEncapsulationContextOnSendRule
  • Press the Enter key to save the changes.
  • Double-click it and set the base to Hexadecimal and the Data value to 2.
  • Save the changes and restart the computer.

Method #5 – Try other VPN providers

Credit : Stefan Coders/Pixabay Some major VPN service providers have little to no compatibility issues with Windows 10. This means that such errors can be avoided or even eliminated. You can check out these companies and sign up for a free trial to find out which one best suits your needs. That’s it. You can also try disabling the third-party firewall if it is configured on your computer. If the 789 error does not resolve, you may need to contact your VPN service provider to help you resolve the issue. ARE YOU STILL HAVING A PROBLEM? Try this tool to repair Windows errors and safely optimize system performance in automatic mode.If you’ve recently upgraded to Windows 10 and are using a Virtual Private Network (VPN) to protect your data and stay anonymous online, you may have trouble connecting to your VPN. We ran into this issue ourselves and wanted to share the fix we found.. Read more about error 789 l2tp windows 7 and let us know what you think.

Frequently Asked Questions

How do I fix L2TP connection attempt failed?

If Windows 10 shows you the error code 789 on starting up a VPN connection, don’t worry. This error can be fixed easily. Here are the steps to take: 1. Open the Registry Editor 2. Navigate to the following key: HKLM\SYSTEM\CurrentControlSet\Services\RasMan\PPP\EAP\13. Delete the value named L2TP 13. Restart the computer 4. Relaunch the VPN connection This guide aims to solve one of the most common problems with VPN connections when using L2TP as the final layer with windows 10, fix 789 L2TP Connection attempt failed.

Has failed the error code returned on failure is 789?

Windows 10 has been known to throw up a variety of error codes during operation. If you are a user of the L2TP protocol to connect to a VPN service, you might have encountered an error code of 789. While you may be tempted to ignore this error, this 789 error message can actually be quite a big deal – it can stop your Windows 10 L2TP VPN connection from working. Has failed the error code returned on failure is 789? Then you will need to restart the computer. This is what you need to do. First of all, you need to press Ctrl + Alt + Del. Then you need to select Task Manager. After that you need to click on the Processes tab. After that you need to select the Windows 10. Then you need to click on the End Process button. And after that you need to restart the computer.

What is L2TP VPN error?

When you try to connect to a L2TP based VPN, that is hosted on a Windows Server 2012 R2, you may get an error. This error is caused by a missing certificate. To resolve this issue, you need to import the certificate in your local machine’s Trusted Root Certification Authorities store. We will walk you through this process step-by-step: L2TP VPN error 789 is a problem that has been reported by people who use the Windows 10 operating system. The error occurs when you try to connect to a VPN server with the L2TP protocol.

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