Windows 10: L2TP Connection attempt failed - April 2022

I set up a clients computer before Christmas and configured a L2TP with preshared key VPN which had been working without issues up until a few weeks ago. I can confirm that the following is in place:All ports corrected forwarded.Regedit - AssumeUDPEncapsulationContextOnSendRule / DWORD 32 bit Value = 2Adapter PPP settings - Enable LCP extensions ticked for useAdapter Security tab - Allow these protocols / Challenge Handshake Authentication Protocol CHAP & Microsoft CHAP Version 2 MS-SHAP v2All Windows updates appliedI understand that L2TP was broken around January, and then a patch

:)

 

windows 10 l2tp/ipsec vpn connection failed

The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

kindly send regedit settings for this to connect secure-key l2tp for windows 10

in windows 10 regedit HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec

ipsec not showng. than we are facing problem to connect give us solution.

 

Error: 788, when connecting to L2TP VPN

Hi there, recently I got this error when connecting to "L2TP/IPSec with certificate" VPN. I'm not sure what cause this.

I have already follow some of this steps with no luck :

• Adding AssumeUDPEncapsulationContextOnSendRule
• Restarting both IKE and IPSec services
• Allowing both CHAP and MS-CHAP v2
• Reset network connection
• Connect to different provider
• Re-adding VPN settings

There also little bit information can be found in the event viewer :

CoId={AEE0E2A8-34DF-41BB-B5F0-0458EFD41751}: The user xxx\xxx has started dialing a VPN connection using a per-user connection profile named yes. The connection settings are:

Dial-in User = *\

VpnStrategy = L2TP

DataEncryption = Requested

PrerequisiteEntry =

AutoLogon = No

UseRasCredentials = Yes

Authentication Type = PAP

Ipv4DefaultGateway = Yes

Ipv4AddressAssignment = By Server

Ipv4DNSServerAssignment = By Server

Ipv6DefaultGateway = Yes

Ipv6AddressAssignment = By Server

Ipv6DNSServerAssignment = By Server

IpDnsFlags =

IpNBTEnabled = Yes

UseFlags = Private Connection

ConnectOnWinlogon = No

IPsec authentication for L2TP = Machine certificate.

CoId={AEE0E2A8-34DF-41BB-B5F0-0458EFD41751}: The user xxx\xxx is trying to establish a link to the Remote Access Server for the connection named yes using the following device:

Server address/Phone Number = xxx.xxx.xxx.xxx

Device = WAN Miniport (L2TP)

Port = VPN3-1

MediaType = VPN.

CoId={AEE0E2A8-34DF-41BB-B5F0-0458EFD41751}: The user xxx\xxx dialed a connection named yes which has failed. The error code returned on failure is 788.

***Original title: VPN Error 788***

 

L2TP VPN on Lumia 950 giving error code 812

Hello,

I recently purchased a Lumia 950 (AT&T running Windows 10 Mobile build 10.0.10586.0.

When I configure my work IPSec L2TP VPN connection on my phone and then attempt to connect, it attempts to connect, then fails displaying the error:

The VPN connection failed with error code 812.

This seems to happen after the credentials are accepted.

During the connection attempt on the phone, the status display progresses as follows:

• Connecting to <address of my VPN server>
• Verifying your credentials
• Connecting to <address of my VPN server>
• The VPN connection failed with error code 812.

When I look at the logs of my VPN server, a connection is actually established successfully by the client, then immediately terminated.

I'm not positive who is terminating the connection on who (client or server).

VPN Settings configured on the Lumia 950 are as follows:

Connection name: My Work

Server name or address: <address of my VPN server>

VPN Type: L2TP/IPsec with pre-shared key

Pre-shared key: <pre-shared key that is configured on my VPN server & working on other devices>

Type of sign-in info: User name and password

I have typed the username & password in again multiple times to confirm it is correct. It is.

Furthermore, I have a Lumia 925 running Windows Phone 8.1. It connects perfectly using these same settings.

It seems something changed in Windows 10 Mobile that caused this VPN connection to stop working.

Do you have any suggestions on how I might be able to get this resolved?

I really need the VPN to be working.

Thanks!

-

Doug Mortensen

Impala Networks