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This is the first blog post I’ve written in ages that wasn’t related to my day job, and the first time I’ve even typed that phrase in a blog post, which is odd. That’s because I’m writing this blog post on the end of a trip to the Netherlands, which is where I live. I’m on vacation, which means I’m not blogging, and I’m normally a couple posts behind on my programming work, so I’ll try to write this post up as quickly as I can.

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Milan Stanojevic Co-Editor in Chief Milan has had a passion for computers since childhood, which has led him to become interested in all PC-related technologies. Before joining WindowsReport, he worked as a front-end web developer. Read more Updated: 19. May 2021 Published: May 2020

  • VPN error 789 occurs when a Windows 10 system is not properly configured and connected to a VPN using the L2TP protocol.
  • This error can be fixed by a quick reset of the network adapter via the Device Manager.
  • The IPSec configuration must be changed, as well as the backup solution, so configure the services as described in our guide.
  • You should also consider switching to a less error-prone virtual private network.

If you are using a VPN, you may get a 789 error message in Windows 10 that says the following: The L2TP connection attempt failed because the security layer encountered a processing error during the initial negotiation with the remote computer. This error occurs when your system is not properly configured to connect to an L2TP server, so the connection attempt fails even before you connect to the server. It is also due to a bad configuration of your operating system, such as Windows 10 in this case. This common error occurs when IPSec negotiation fails for L2TP/IPSec connections. Other possible causes include:

  • The L2TP-based VPN client (or VPN server) is located behind the NAT.
  • An invalid certificate or an invalid pre-shared key is installed on the VPN server or client.
  • There is no machine certificate or trusted machine root certificate on the VPN server.
  • The certificate of the machine on the VPN server does not have server authentication, because the EKU

Before trying any of these solutions, make sure L2TP and IPSec pass-through options are enabled on your router. If you configure your VPN service manually, make sure you use the pre-shared key 12345678. Here are the solutions you can use to solve Windows 10 VPN error 789 on your computer.

 

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How do I fix VPN error 789 in Windows 10?

  1. Resetting the Network Adapter
  2. Check the certificate
  3. Re-enable IPSec on your computer

1. Network adapter reset

  1. Right-click on Start and select Device Manager.
  2. Identify the network adapter and right-click on it, then select Uninstall Device.
  3. Press OK.
  4. Restart your computer. The device is reinstalled and must be reset to the default settings.

Updating the network adapter driver can quickly resolve this issue. Therefore, try it by following the above steps.

2. Verification of certificate

It is very important to ensure that the correct certificate is used on both the client and server side. If these two settings do not match, you cannot use the virtual private network. You may need to renew the certificate from your ISP. If you are using a pre-shared key (PSK), make sure that the same PSK is configured on the client side and on the VPN server machine.

3. Re-enable IPSec on your computer

  1. Press the Windows + R key combination to start the run.
  2. Type services.msc and press Enter or click OK.Disabling the Windows error-reporting service
  3. Locate the IKE service and AuthIP IPSec encryption modules.
  4. Find the IPSec policy agent.
  5. Check the status of both services. If a startup message appears, press the restart button. If the boot option is disabled, enable it.
  6. Double-click on each of them.
  7. Select the startup type.
  8. Change it to automatic.
  9. Save the changes.
  10. Restart your VPN service.

If you have followed all the above steps carefully, the VPN should work without any problem as the login settings have been reset to the defaults. However, if this does not work, you must manually set the encryption method on both the server and client sides to be compatible. If there is a user-specific issue on your computer but you still get the error message L2TP connection error, you can also contact the customer support or technical support of your respective VPN provider. Of course you can also change the software completely. Just check out our list of the best VPNs for Windows 10 and choose the one that suits your needs. Let us know if any of these solutions solved Windows 10 VPN error 789 by leaving a comment in the section below. Frequently asked questions Not enough details. It’s hard to understand Other Contact an expert Take part in the discussion

Frequently Asked Questions

How do I fix VPN error 789?

9 out of 10 times, a VPN error message like this will be something your VPN provider can fix. But 8 out of 10 times, the error you’re getting is from your ISP or the home network. The solution is to contact your VPN provider to make sure that the connection is a go. Sometimes it’s just a fluke, but sometimes it’s something you’ve done, like running a speed test. If you’re getting error 789 any time you try to connect, go into your VPN app and click ‘help’ to contact the provider and solve the problem. If you are experiencing an error with your VPN connection, you may have come across this error message: “VPN Connection Failed – Error 789. Please contact your IT department to seek further assistance.”. This error can be a little confusing as it can cause some headaches if it’s coming up every time you try to use your VPN.  What is really going on behind this error and what can you do to get this error resolved?

How do I fix Error 800 789 L2TP and setup VPN in Windows 7?

I have been playing with Error 800 789 L2TP and setup VPN in Windows 7 since last week, because I think there are a number of people who have encountered this problem. This text is sensitive. Click edit and regenerate for new copy.

How do you fix the L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer?

L2TP is a file-sharing protocol widely used in VPN connections, and the client implementation of the L2TP protocol is also used in the Windows operating system. In this article, we will show you how to fix the L2TP connection error 789 when trying to connect to a Windows 10 VPN server. The recent L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer. This error may appear unexpectedly when using the L2TP in the following configurations:

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