How to Resolve the VPN Error 789 in Windows 7/10

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Most users use VPNs that help them browse the internet privately and anonymously from anywhere. In general, VPNs are the most useful solution, but at the same time, they also have some limitations.

Moreover, we see that Internet users encounter various VPN errors more often than not, regardless of the operating system they use. In this regard, we can say that users may encounter several VPN error codes.

For example, if we use a VPN and don’t want to be interrupted by a “connection failed” error message, it will appear from time to time and will be reported as “VPN error 789: L2TP connection attempt failed“. VPN Error 789 is one of the most common errors that occur when a user tries to connect to L2TP.

Users should not worry about this 789 error as these types of error messages are fixed in no time. To do so, you need to follow the following methods to solve VPN error 789: L2TP connection attempt failed” on Windows 10/7, which we will cover in today’s article.

Before that, we need to know what is VPN Error 789 and what are the possible causes of this VPN 789 error.

What are the causes of the VPN error 789?

VPN Error 789 is one of the most common errors that occur when a user tries to connect to L2TP. In this case, the L2TP connection attempt failed because the security layer encountered a processing error during the initial negotiation with the remote computer.

This error can occur when creating a client session using the Windows 2000 terminal services. Or if your system is not properly configured to connect to an L2TP server. Other possible causes are usually :

• The L2TP-based VPN client (or VPN server) is behind a NAT.
• An invalid certificate or pre-shared key is installed on the VPN server or client.
• The machine certificate or trusted root machine certificate is not on the VPN server.
• The machine certificate on the VPN server does not have `Server Authentication` as an EKU.

All versions of the Windows operating system are prone to this VPN error. And most VPN users face this problem mainly because of Windows 7 L2TP IPSEC.

How to repair the VPN error 789?

Resetting the network adapter

1. Right-click on Start and select Device Manager.
2. Identify the network adapter, right-click it and select Uninstall Device.
3. Click OK.
4. Reboot your computer. The device will be reinstalled and should be restored to its default settings.

Updating the network adapter driver can quickly resolve this problem, so be sure to try the above steps.

Enable again the IPSec on your computer

1. Press the Windows + R key combination to run Run.
2. Type services.MSC and press Enter or press OK.
3. Locate the IKE service and AuthIP IPSec Keying Modules.
4. Locate the IPSec policy agent.
5. Check the status of both services. If it is set to Started, click Restart. If Started is disabled, turn it on.
6. Double-click each of the two services.
7. Select the startup type.
8. Change it to Automatic.
9. Save your changes.
10. Restart your VPN service.

Verify the certificate

It is very important that the correct certificate is used on both the client and server sides. If the two do not match, you will not be able to use the virtual private network. You may need to renew the certificate with your ISP.

If you use a pre-shared key (PSK), make sure that the same PSK is configured on the client-side and on the VPN server machine.

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