Unable to access VPN server via L2TP

[TK_Liew]

@dlemmink

Could you share that entry?
I have a Win10 computer that refuses to connect.
Other OS clients are successful.

Please check for my answer below.

L2TP with IPsec VPN and Windows Client

This should be the limitation of Windows machine if the L2TP/IPsec server (Peplink router in this case) is behind a NAT device. If your Balance router is behind a NAT device, please refer to the URL link below to modify the Windows registry. https://support.microsoft.com/en-us/help/926179/how-to-configure-an-l2tp-ipsec-server-behind-a-nat-t-device-in-windows