Refreshing the network adapter driver can make this problem go away quickly so make sure you try it out by performing the steps above. The device will reinstall and should reset it to default settings. Identify your network adapter and right-click on it then select Uninstall device.Press the Windows key + X and select Device Manager.How do I fix the VPN error 789 on Windows 10 & 11? If this doesn’t work, here are more solutions you can use to fix this problem on your PC. If you configured your VPN service manually, then make sure you use the preshared key 12345678. Machine Certificate on VPN Server does not have Server Authentication as the EKUīefore trying any of these solutions, ensure that L2TP and IPSec pass-through options are enabled from your router.A machine certificate or trusted root machine certificate is not present on the VPN server.The wrong certificate or pre-shared key is set on the VPN server or client.L2TP-based VPN client (or VPN server) is behind NAT. ![]() This generic error is thrown when the IPSec negotiation fails for the L2TP/IPSec connections. ![]() It is also linked to the incorrect configuration of your operating system like Windows 10 in this case.
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