FIX: Windows 10 VPN error 789 connection failed due to security issues
If you’re using a VPN, and get prompted with the Windows 10 VPN error 789 that states: “The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer” the causes may be within your system.
This error pops up when your system is not properly set up to connect to an L2TP server, thus the connection attempt fails even before you establish a connection with the server.
It is also linked to incorrect configuration of your operating system like Windows 10 in this case. This generic error is thrown when the IPSec negotiation fails for the L2TP/IPSec connections.
Other possible causes include:
- L2TP based VPN client (or VPN server) is behind NAT.
- Wrong certificate or pre-shared key is set on the VPN server or client
- Machine certificate or trusted root machine certificate is not present on the VPN server.
- Machine Certificate on VPN Server does not have ‘Server Authentication’ as the EKU
Here are solutions you can use to fix Windows 10 VPN error 789 on your computer.
FIX: Windows 10 VPN error 789
Before trying any of these solutions, ensure that L2TP and IPSec pass-through options are enabled from your router. If you configured your VPN service manually, then make sure you use the preshared key 12345678.
Trusted by 15milion users worldwide, CyberGhost VPN is recommended for its good performance and has a highly responsive support team. You can rely on one of the leaders on the VPN market.
- Get now CyberGhost VPN (currently 77% off)
1. Reset network adapter
- Right click Start and select Device Manager
- Find Network adapters and click to expand the list
- Identify your network adapter and right click on it then select Uninstall
- Click OK
- Restart your computer. The device will reinstall and should reset it to default settings
If this doesn’t fix Windows 10 VPN error 789, try the next solution.
2. Check the certificate
Ensure the correct certificate is used both on the client and the server side. In case Pre Shared Key (PSK) is used, ensure that the same PSK is configured on the client side, and the VPN server machine.
3. Re-enable IPSec on your computer
- Right click Start and select Run
- Type services.msc
- Find ‘IKE and AuthIP IPSec Keying Modules’
- Find IPSec Policy Agent’
- Check the status. If it says ‘started’ click to restart. If the ‘started’ option is disabled, enable it
- Double click on each of the two
- Select Startup type
- Change it to Automatic
- Save the changes
- Restart your VPN service
Once you have done all the steps above carefully, the VPN should work smoothly as the protocol settings have been reset to default. If, however, it doesn’t work, you have to manually set the encryption method both for the server and the client side, in order for them to be compatible.
In case you have a user-specific issue on your computer yet you still get Windows 10 VPN error 789 after trying any of the above solutions, you can also contact the customer care or tech support team for your specific VPN provider and share the details for further assistance.
Do let us know if any of these solutions fixed the Windows 10 VPN error 789 by leaving a comment in the section below.
RELATED STORIES TO CHECK OUT:
- 6 of the best VPN for NOW TV to enjoy unrestricted TV shows
- 10 best VPN software clients for Windows 10
- VPN won’t work with Netflix: Here are 8 solutions to fix it
- VPN is not working on your tablet? Here are 7 quick fixes to resolve it
The Windows 10 October 2018 Update (otherwise 18H2) rollout might now be two to three weeks away. For the last few months, new build previews […]
Microsoft released a new Windows 7 update to the general public. Update KB4457139 is actually a preview of the upcoming monthly rollup update and allows users […]
The Windows 10 October 2018 Update is just around the corner. Microsoft is expected to release this new OS version in October, although the exact […]