Fortigate L2TP / IPSEC VPN with Windows 10 Native Client

Hello,

I am trying to establish a secure VPN connection with a Win10 Client Native VPN to our Fortigate 6.0.4

As the Win 10 standard settings are not secure, i tried to configure the VPN with following Powershell command:

Add-VpnConnection -Name "MyVPN" -ServerAddress myvpn.xy -TunnelType "L2tp" -L2tpPsk "123456" -AllUserConnection

Set-VpnConnectionIPsecConfiguration -ConnectionName "MyVPN" -AuthenticationTransformConstants None -CipherTransformConstants AES256 -EncryptionMethod AES128 -IntegrityCheckMethod SHA256 -PfsGroup PFS2048 -DHGroup Group14 -PassThru -Force -AllUserConnection

And the Fortigate VPN:

Network:

NAT Traversal: Enable

Dead Peer Detection: On Demand

Authentication:

Pre-shared Key

IKE Version 1 Main-Mode

Accept Types: Any peer ID

Phase 1 Proposal

Encryption: AES128 Authentication: SHA256

DH-Group 14

Key Lifetime 28800

XAUTH: Disabled

Phase 2 Proposal Encryption AES128 Authentication SHA256

DH-Group 14

Key Lifetime 3600

But i always get error Messages and i am not sure if the Win10 Parameters match.

Was anyone able to set this up?

Kind regards

Daniel